Percentile Scores Research Articles

Gastrointestinal and Gastroesophageal Reflux Scale Reference Values.

The purpose of this study was to determine age-based reference values for the Gastrointestinal and Gastroesophageal Reflux (GIGER) Scale for Infants and Toddlers. GIGER data from healthy, full-term born children under 2 years of age were used to determine reference values. For each age group, median, interquartile range, 90th, and 95th percentile scores were calculated for each subscale and the total score. 90th percentile scores were also calculated for each of the 36 items based on the full sample. Data from 625 children were used to determine reference values for children 0-2, 2-4, 4-6, 6-8, 8-10, 10-12, and 12-24 months. In healthy, full-term infants, gastrointestinal and gastroesophageal reflux symptoms improved over the first 24 months of life, with the most improvement occurring over the first 2 months. The GIGER is a 36-item measure of gastrointestinal and gastroesophageal reflux symptoms for children under 2 years old that has evidence of adequate psychometrics for clinical practice and research. The age-based reference values established in this study can be used to guide score interpretation and determine when a child's symptoms warrant further investigation. This may help identify infants and toddlers with significant symptoms earlier so that they can obtain the care they need.

Using social risks to predict unplanned hospital readmission and emergency care among hospitalized Veterans.

(1) To estimate the association of social risk factors with unplanned readmission and emergency care after a hospital stay. (2) To create a social risk scoring index. We analyzed administrative data from the Department of Veterans Affairs (VA) Corporate Data Warehouse. Settings were VA medical centers that participated in a national social work staffing program. We grouped socially relevant diagnoses, screenings, assessments, and procedure codes into nine social risk domains. We used logistic regression to examine the extent to which domains predicted unplanned hospital readmission and emergency department (ED) use in 30 days after hospital discharge. Covariates were age, sex, and medical readmission risk score. We used model estimates to create a percentile score signaling Veterans' health-related social risk. We included 156,690 Veterans' admissions to a VA hospital with discharged to home from 1 October, 2016 to 30 September, 2022. The 30-day rate of unplanned readmission was 0.074 and of ED use was 0.240. After adjustment, the social risks with greatest probability of readmission were food insecurity (adjusted probability = 0.091 [95% confidence interval: 0.082, 0.101]), legal need (0.090 [0.079, 0.102]), and neighborhood deprivation (0.081 [0.081, 0.108]); versus no social risk (0.052). The greatest adjusted probabilities of ED use were among those who had experienced food insecurity (adjusted probability 0.28 [0.26, 0.30]), legal problems (0.28 [0.26, 0.30]), and violence (0.27 [0.25, 0.29]), versus no social risk (0.21). Veterans with social risk scores in the 95th percentile had greater rates of unplanned care than those with 95th percentile Care Assessment Needs score, a clinical prediction tool used in the VA. Veterans with social risks may need specialized interventions and targeted resources after a hospital stay. We propose a scoring method to rate social risk for use in clinical practice and future research.

Normative Cognitive Scores in Western India, Stratified by Age, Rurality, Cognitive Domains, and Psychiatric Comorbidity.

Indian ethnic and educational diversities necessitate obtaining normative cognitive data in different populations. We aimed to evaluate cognitive scores using a Marathi translation of the Kolkata cognitive battery (KCB) and to study the association of KCB components with depression and sociodemographic variables. We studied 2,651 individuals aged ≥40 years without preexisting neuropsychiatric conditions from urban (Mumbai) and rural districts of Maharashtra. For each component of KCB, the lowest 10th percentile score was used to define cognitive impairment. We studied 1,435 (54%) rural and 1,216 (46%) urban residents equally divided by gender (1,316 women and 1,335 men), average age 54 years. KCB scores were significantly lower with female sex, older age, illiteracy, and depression. The largest effect sizes attributable to these factors were in the domains of calculation (gender), visuoconstructional ability (VCA) (rurality), and verbal fluency (VF) (depression). Scores remained significantly lower in rural residents after controlling for age, sex, and education, particularly for VCA, immediate recall, and calculation. This Marathi KCB, having been validated on large urban as well as rural samples, may be used to study cognition in Marathi-speaking populations with appropriate cutoffs tailored to the degree of urbanization of the population.

The Hong Kong version of Montreal Cognitive Assessment for the Visually Impaired (HKMoCA-VI): Proposed cut-off and cognitive functioning survey of visually impaired elderly in residential homes.

Visual impairment has been strongly associated with the incidence of dementia. Appropriate cognitive screening for the elderly with visual impairment is crucial for early identification of dementia and its management. Due to challenges in processing visually presented stimuli among participants, the cut-off score of the Hong Kong version of the Montreal Cognitive Assessment for the Visually Impaired (HKMoCA-VI), also known as MoCA-BLIND or MoCA-22, was unknown. Besides, the cognitive status of elderly with visual impairment residing in care homes is rarely investigated. The current study aimed to 1) establish the cut-off score for HKMoCA-VI and 2) examine the general cognitive functioning of elderly with visual impairment living in residential homes in Hong Kong in terms of MoCA-VI percentile scores. HKMoCA-VI and the Cantonese version of the Mini-Mental State Examination (CMMSE) were administered to 123 visually impaired elderly residents in care homes in Hong Kong. Percentile scores of HKMoCA-VI by age and education level were determined, and the concurrent validity, sensitivity, and specificity of HKMoCA-VI were assessed. A cut-off score 12 was suggested for HKMoCA-VI, which yielded a sensitivity and specificity of 89.29% and 83.58%, respectively. Moreover, it strongly correlated with CMMSE, indicating satisfactory concurrent validity. HKMoCA-VI is suggested to be a viable cognitive screening tool for elderly individuals with visual impairment in residential homes. Further modifications to enhance the sensitivity and specificity of the measure are proposed.

Dissecting bias of ChatGPT in college major recommendations

AbstractLarge language models (LLMs) such as ChatGPT play a crucial role in guiding critical decisions nowadays, such as in choosing a college major. Therefore, it is essential to assess the limitations of these models’ recommendations and understand any potential biases that may mislead human decisions. In this study, I investigate bias in terms of GPT-3.5 Turbo’s college major recommendations for students with various profiles, looking at demographic disparities in factors such as race, gender, and socioeconomic status, as well as educational disparities such as score percentiles. To conduct this analysis, I sourced public data for California seniors who have taken standardized tests like the California Standard Test (CAST) in 2023. By constructing prompts for the ChatGPT API, allowing the model to recommend majors based on high school student profiles, I evaluate bias using various metrics, including the Jaccard Coefficient, Wasserstein Metric, and STEM Disparity Score. The results of this study reveal a significant disparity in the set of recommended college majors, irrespective of the bias metric applied. Notably, the most pronounced disparities are observed for students who fall into minority categories, such as LGBTQ + , Hispanic, or the socioeconomically disadvantaged. Within these groups, ChatGPT demonstrates a lower likelihood of recommending STEM majors compared to a baseline scenario where these criteria are unspecified. For example, when employing the STEM Disparity Score metric, an LGBTQ + student scoring at the 50th percentile faces a 50% reduced chance of receiving a STEM major recommendation in comparison to a male student, with all other factors held constant. Additionally, an average Asian student is three times more likely to receive a STEM major recommendation than an African-American student. Meanwhile, students facing socioeconomic disadvantages have a 30% lower chance of being recommended a STEM major compared to their more privileged counterparts. These findings highlight the pressing need to acknowledge and rectify biases within language models, especially when they play a critical role in shaping personalized decisions. Addressing these disparities is essential to foster a more equitable educational and career environment for all students.

Hybrid machine learning for stock price prediction in the Moroccan banking sector

Analyzing historical stock market data using machine-learning techniques is crucial for data scientists and researchers to optimize stock price prediction models. This study uses machine learning regression algorithms and feature selection methods to optimize a simulated stock price prediction model using real historical data from Bank of Africa, a Moroccan bank. The approach compares multiple supervised regression algorithms, such as linear regression, extreme gradient boosting, ordinary least squared, random forest regressor, a linear least-squares L2-regularized, epsilon-support vector regression, and linear support vector regression. Each of these algorithms is associated with different feature selection algorithms to improve the performance of the prediction model. The analysis results revealed that hybridizing algorithms between the highest score percentiles, univariate linear regression, and linear support vector regression perform better according to the root mean squared error and R2-Score measures. This approach overcomes the problems associated with high-dimensional data by reducing the number of features and improving prediction accuracy.

Establishing the homologous recombination score threshold in metastatic prostate cancer patients to predict the efficacy of PARP inhibitors

BackgroundThe homologous recombination deficiency (HRD) score serves as a promising biomarker to identify patients who are eligible for treatment with PARP inhibitors (PARPi). Previous studies have suggested a 3-biomarker Genomic Instability Score (GIS) threshold of ≥ 42 as a valid biomarker to predict response to PARPi in patients with ovarian cancer and breast cancer. However, the GIS threshold for prostate cancer (PCa) is still lacking. Here, we conducted an exploratory analysis to investigate an appropriate HRD score threshold and to evaluate its ability to predict response to PARPi in PCa patients. MethodsA total of 181 patients with metastatic castration-resistant PCa were included in this study. Tumor tissue specimens were collected for targeted next-generation sequencing for homologous recombination repair (HRR) genes and copy number variation (CNV) analysis. The HRD score was calculated based on over 50,000 single-nucleotide polymorphisms (SNP) distributed across the human genome, incorporating three SNP-based assays: loss of heterozygosity, telomeric allelic imbalance, and large-scale state transition. The HRD score threshold was set at the last 5th percentile of the HRD scores in our cohort of known HRR-deficient tumors. The relationship between the HRD score and the efficacy in 16 patients of our cohort who received PARPi treatment were retrospectively analyzed. ResultsGenomic testing was succeeded in 162 patients. In our cohort, 61 patients (37.7%) had HRR mutations (HRRm). BRCA mutations occurred in 15 patients (9.3%). The median HRD score was 4 (ranged from 0 to 57) in the total cohort, which is much lower than that in breast and ovarian cancers. Patients who harbored HRRm and BRCA or TP53 mutations had higher HRD scores. CNV occured more frequently in patients with HRRm. The last 5th percentile of HRD scores was 43 in the HRR-mutant cohort and consequently HRD high was defined as HRD scores ≥43. In the 16 patients who received PARPi in our cohort, 4 patients with a high HRD score achieved an objective response rate (ORR) of 100% while 12 patients with a low HRD score achieved an ORR of 8.3%. Progression-free survival (PFS) in HRD high patients was longer compared to HRD low patients, regardless of HRRm. ConclusionsA HRD score threshold of 43 was established and preliminarily validated to predict the efficacy of PARPi in this study. Future studies are needed to further verify this threshold.

Analysis of copy number variants detected by sequencing in spontaneous abortion.

The incidence of spontaneous abortion (SA), which affects approximately 15-20% of pregnancies, is the most common complication of early pregnancy. Pathogenic copy number variations (CNVs) are recognized as potential genetic causes of SA. However, CNVs of variants of uncertain significance (VOUS) have been identified in products of conceptions (POCs), and their correlation with SA remains uncertain. Of 189 spontaneous abortion cases, trisomy 16 was the most common numerical chromosome abnormality, followed by monosomy X. CNVs most often occurred on chromosomes 4 and 8. Gene Ontology and signaling pathway analysis revealed significant enrichment of genes related to nervous system development, transmembrane transport, cell adhesion, and structural components of chromatin. Furthermore, genes within the VOUS CNVs were screened by integrating human placental expression profiles, PhyloP scores, and Residual Variance Intolerance Score (RVIS) percentiles to identify potential candidate genes associated with spontaneous abortion. Fourteen potential candidate genes (LZTR1, TSHZ1, AMIGO2, H1-4, H2BC4, H2AC7, H3C8, H4C3, H3C6, PHKG2, PRR14, RNF40, SRCAP, ZNF629) were identified. Variations in LZTR1, TSHZ1, and H4C3 may contribute to embryonic lethality. CNV sequencing (CNV-seq) analysis is an effective technique for detecting chromosomal abnormalities in POCs and identifying potential candidate genes for SA.

Evaluation of Knowledge and Awareness of Dietary Nitrate Among Clinical Dietitians in Jeddah, Saudi Arabia: A Cross-Sectional Study.

Background and objectives Dietary nitrate (NO3) plays an important role in human physiological processes.In the past, inorganic NO3was viewed negatively due to its link with carcinogenic effects, notably nitrosamine formation in the stomach; yet, current perspectives acknowledge NO3 as a potentially beneficial dietary element. Nutrition professionals (NPs) are crucial in promoting NO3 awareness in health and academic settings. The study aimed toevaluate the knowledge of NPs in Jeddah,Saudi Arabia, regarding the biological roles of dietary NO3, taking into consideration their qualifications and years of experience. Methods A cross-sectional study was conducted among NPs who had graduated from clinical nutrition programs or were employed in clinical or academic settings. A validated 12-item online questionnaire was used to assess dietary NO3 knowledge across five areas: health effects, dietary sources, recommendations, biomarkers of intake, andmetabolism. The nitrate knowledge index (NKI) score was used to evaluate responses. Results Eighty-nine female NPs out of 144 completed the questionnaire. Most were ≤30 years old (75.4%) and had an undergraduate degree in clinical nutrition (70.8%), but 37 of them had ≤3 years of experience (62.7%). Overall, poor knowledge scores were observed among NPs, with a median (25th and 75th percentile) score of 10 (6, 13) out of 23. The majority (64%) perceived NO3 to be beneficial. However, most of the participants did not know its benefits in lowering blood pressure (BP) (68.5%) and were unsure about the effects of nitrate on cognitive function (60.7%) or kidney function (57.3%). Almost half of the NPs were unaware of NO3 sources and unsure about the mechanisms of the conversion of NO3into nitrogen dioxide(NO2) in the mouth (48.3%). Overall, knowledge of factors that affect NO3 content in food was good. No significant differences were observed in the median NKI scores among the participants based on their level of education or years of experience. Conclusion This study suggests NPs lack knowledge about dietary NO3.To address this, educational programs should be developed and implemented in clinical and academic settings.

More Than a Flesh Wound: Trisomy 21 Patients Undergoing Posterior Spinal Fusion for Scoliosis Have High Odds of Wound Complications.

Retrospective cohort study. Patients with trisomy 21 (T21) often have soft tissue differences that lead to greater risk of postoperative wound complications. Our aim was to use a matched cohort of adolescent idiopathic scoliosis (AIS) patients with >2year outcomes to determine odds of specific wound complications when comparing T21 and AIS patients. 14 T21 and 544 AIS patients were available for matching. Propensity score matching was conducted using logistic regression models and yielded a 1:5 match of 14 T21 patients and 70 AIS patients. Bivariate analyses were conducted across both patient groups. The proportion of wound complications was estimated along with a 95% confidence interval. Multivariable logistic regression analysis was utilized to determine if there was a significant association between T21 patients and wound outcomes. 64% of T21 patients experienced a wound complication (9/14; 95% CI = 35.63-86.02) while only 3% of the AIS patients experienced a wound complication (2/70; 95% CI = .50-10.86). Patients with T21 had 56.6 times the odds of having a wound complication compared to matched AIS patients (OR = 56.57; 95% CI = 8.12-394.35; P < .001), controlling for age at surgery, BMI percentile, and propensity score. T21 patients had 10.4 times the odds of reoperation compared to AIS patients (OR = 10.36; 95% CI = 1.62-66.02; P = .01). T21 patients have 10.4× the odds of reoperation and 56.6× the odds of overall wound complication when compared to AIS patients in a 1:5 matched cohort with appropriate controls. This is important for surgical planning, surgeon awareness, and communication with families preoperatively.

Salivary biomarkers as assessment of metabolic function and inflammation in children with obesity

Childhood obesity increases adult metabolic and cardiovascular disease risk. Using blood for long-term biomarker analysis in children is problematic because of the discomfort, pain, and anxiety associated with frequent blood draws. Noninvasive methods are vital for predicting childhood obesity complications. This study examined body mass index-for-age percentile scores (zBMI) as a predictor of salivary biomarkers of metabolism and inflammation, including insulin and C-Reactive Protein (CRP), over time. A school sample of 288 adolescents (Mage = 12.1 at study initiation; 46% female; 48% Black, 37% non-Hispanic White, 15% Hispanic or other minorities) were enrolled from greater Birmingham, Alabama. Participants provided salivary samples across four days once per year from 2019–2021. In year 1 of the study, 19% of adolescents were overweight, 18% had obesity, 6.6% had severe obesity, and 7.3% had very severe obesity based on the 2022 CDC Extended BMI-for-Age Growth Charts. Multivariable models showed that lower parental income was associated with an increased risk of obesity (OR = 0.91; 95% CI = 0.85, 0.97; p = 0.009). Greater concentrated poverty, a measure of spatial distribution of socioeconomic deprivation, was associated with an increased risk of severe or very severe obesity (OR = 1.58; 95% CI = 1.01, 2.46; p = 0.043). However, race/ethnicity was not associated with obesity risk. Longitudinal analyses showed that greater zBMI in year 1 was associated with greater salivary CRP ( β = 0.188, SE = 0.058, p = 0.001) and insulin ( β = 0.263, SE = 0.076, p&lt;0.001) in years 2 and 3 of the study after adjusting for year 1 biomarker levels, sex, race/ethnicity, and concentrated poverty. Multivariable models indicated that an accelerated increase in zBMI/year was associated with an accelerated increase in CRP/year ( β = 0.119, SE = 0.048, p = 0.014), but there was no association between the rates of change in zBMI and insulin. Future analyses will incorporate additional hormones, such as adiponectin, and inflammatory cytokines measured in saliva. In conclusion, these results indicate that salivary biomarkers can capture physiological differences associated with zBMI in school-age children. Saliva may constitute a useful non-invasive tool for evaluating markers of inflammation and/or metabolism related to zBMI in children outside clinical settings. This research was supported by an Institute of Education Sciences, U.S. Department of Education Grant (R305A180074) to SM and RE and a National Heart, Lung, and Blood Institute K99R00 Grant (1K99HL165091-01A1) to KMK. This is the full abstract presented at the American Physiology Summit 2024 meeting and is only available in HTML format. There are no additional versions or additional content available for this abstract. Physiology was not involved in the peer review process.

A Visualization and Radiation Treatment Plan Quality Scoring Method for Triage in a Population-Based Context

PurposeTo develop a clinically intuitive and easily understandable scoring method using statistical metrics to visually determine the quality of a radiation treatment plan. Methods and MaterialsData from 111 head and neck cancer patients were used to establish a percentile-based scoring system for treatment plan quality evaluation on both a plan-by-plan and objective-by-objective basis. The percentile scores for each clinical objective and the overall treatment plan score were then visualized using a daisy plot. To validate our scoring method, 6 physicians were recruited to assess 60 plans each using a scoring table consisting of a 5-point Likert scale (with scores ≥3 considered passing). Spearman correlation analysis was conducted to assess the association between increasing treatment plan percentile rank and physician rating, with Likert scores of 1 and 2 representing clinically unacceptable plans, scores of 3 and 4 representing plans needing minor edits, and a score of 5 representing clinically acceptable plans. Receiver operating characteristic curve analysis was used to assess the scoring system's ability to quantify plan quality. ResultsOf the 60 plans scored by the physicians, 8 were deemed as clinically acceptable; these plans had an 89.0th ± 14.5 percentile value using our scoring system. The plans needing minor edits or deemed unacceptable had more variation, with scores falling in the 62.6th ± 25.1 percentile and 35.6th ± 25.7 percentile, respectively. The estimated Spearman correlation coefficient between the physician score and treatment plan percentile was 0.53 (P < .001), indicating a moderate but statistically significant correlation. Receiver operating characteristic curve analysis demonstrated discernment between acceptable and unacceptable plan quality, with an area under the curve of 0.76. ConclusionsOur scoring system correlates with physician ratings while providing intuitive visual feedback for identifying good treatment plan quality, thereby indicating its utility in the quality assurance process.

Surgically-relevant quality of life thresholds for the Short Inflammatory Bowel Disease Questionnaire in Crohn’s disease

Background or PurposeDespite interest in patient-reported outcome measures to track progression in Crohn’s disease, frameworks to apply these questionnaires in the preoperative setting are lacking. Using the short inflammatory bowel disease questionnaire (sIBDQ), this study aimed to describe interpretable quality of life thresholds and examine potential associations with future bowel resection in Crohn’s disease. MethodsAdult Crohn’s disease patients completing an sIBDQ at a clinic visit between 2020-2022 were eligible. A stoplight framework was adopted for sIBDQ scores, including a ‘Resection Red zone’ suggesting poor quality of life that may benefit from discussions about surgery as well as a ‘Nonoperative Green’ zone. Thresholds were identified with both anchor- and distribution-based methods using receiver operating characteristic curve analysis and subgroup percentile scores, respectively. To quantify associations between sIBDQ scores and subsequent bowel resection, multivariable logistic regression models were fit with covariates of age, sex, body mass index, medications, disease pattern and location, resection history, and the Harvey Bradshaw Index. Incremental discriminatory value of the sIBDQ beyond clinical factors was assessed through area under the receiver operating characteristics curve (AUC) with an internal validation through bootstrap resampling. ResultsOf 2003 included patients, 102 underwent Crohn’s-related bowel resection. The sIBDQ Nonoperative Green zone threshold ranged from 61 to 64 and the Resection Red zone from 36 to 38. When adjusting for clinical covariates, a worse sIBDQ score was associated with greater odds of subsequent 90-day bowel resection when considered as a one-point (OR [95% CI], 1.05 [1.03-1.07]) or five-point change (OR [95% CI], 1.25 [1.13-1.40]). Inclusion of the sIBDQ modestly improved discriminative performance (AUC [95% CI] 0.85 [0.85 – 0.86]) relative to models that included only demographics (0.57 [0.57 – 0.58]) or demographics with clinical covariates (0.83 [0.83 – 0.84]). Discussion or ConclusionIn the decision-making process for bowel resection, disease-specific patient-reported outcome measures may be useful to identify Crohn’s disease patients with poor quality of life and promote shared understanding of personalized burden.

Why location matters: associations between county-level characteristics and availability of National Cancer Oncology Research Program and National Cancer Institute sites.

The majority of patients with cancer seek care at community oncology sites; however, most clinical trials are available at National Cancer Institute (NCI)-designated sites. Although the NCI National Cancer Oncology Research Program (NCORP) was designed to address this problem, little is known about the county-level characteristics of NCORP site locations. This cross-sectional analysis determined the association between availability of NCORP or NCI sites and county-level characteristic theme percentile scores from the Center for Disease Control and Prevention's Social Vulnerability Index themes. Health Resources and Services Administration's Area Health Resource Files were used to determine contiguous counties. We estimated risk ratios and 95% confidence intervals (CIs) using modified Poisson regression models to evaluate the association between county-level characteristics and site availability within singular and singular and contiguous counties. Of 3141 included counties, 14% had an NCORP, 2% had an NCI, and 1% had both sites. Among singular counties, for a standard deviation increase in the racial and ethnic theme score, there was a 22% higher likelihood of NCORP site availability (95% CI = 1.10 to 1.36); for a standard deviation increase in the socioeconomic status theme score, there was a 24% lower likelihood of NCORP site availability (95% CI = 0.67 to 0.87). Associations were of smaller magnitude when including contiguous counties. NCI sites were located in more vulnerable counties. NCORP sites were more often in racially diverse counties and less often in socioeconomically vulnerable counties. Research is needed to understand how clinical trial representation will increase if NCORP sites strategically increase their locations in more vulnerable counties.

Atypical Brain Aging and Its Association With Working Memory Performance in Major Depressive Disorder

BackgroundPatients with major depressive disorder (MDD) can present with altered brain structure and deficits in cognitive function similar to those seen in aging. However, the interaction between age-related brain changes and brain development in MDD remains understudied. In a cohort of adolescents and adults with and without MDD, we assessed brain aging differences and associations through a newly developed tool that quantifies normative neurodevelopmental trajectories. MethodsA total of 304 participants with MDD and 236 control participants without depression were recruited and scanned from 3 studies under the Canadian Biomarker Integration Network for Depression. Volumetric data were used to generate brain centile scores, which were examined for 1) differences between participants with MDD and control participants; 2) differences between individuals with versus without severe childhood maltreatment; and 3) correlations with depressive symptom severity, neurocognitive assessment domains, and escitalopram treatment response. ResultsBrain centiles were significantly lower in the MDD group than in the control group. Brain centile was also significantly correlated with working memory in the control group but not the MDD group. No significant associations were observed between depression severity or antidepressant treatment response and brain centiles. Likewise, childhood maltreatment history did not significantly affect brain centiles. ConclusionsConsistent with previous work on machine learning models that predict brain age, brain centile scores differed in people diagnosed with MDD, and MDD was associated with differential relationships between centile scores and working memory. The results support the notion of atypical development and aging in MDD, with implications for neurocognitive deficits associated with aging-related cognitive function.

Steeper at the top: cognitive ability and earnings in Finland and Norway

Abstract We document a convex relationship between earnings rank and cognitive ability for men in Finland and Norway using administrative data on over 350,000 men in each country: the top earnings percentile score on average 1 standard deviation higher than median earners, while median earners score about 0.5 standard deviation higher than the bottom percentile of earners. Top earners also have substantially less variation in cognitive test scores. While some high-scoring men are observed to have very low earnings, the lowest cognitive scores are almost absent among the top earners. Overall, the joint distribution of earnings rank and ability is very similar in Finland and Norway. We find that the slope of the ability curve across earnings ranks is steepest in the upper tail, as is the slope of the earnings curve across cognitive ability. The steep slope of the ability curve across the top earnings percentiles differs markedly from the flat or declining slope recently reported for Sweden.

Flipping the Classroom in Residency Didactics Leads to Higher American Board of Surgery in-Training Examination Scores

Didactic education in General Surgery (GS) residency typically follows a nationally standardized curriculum; however, instructional format varies by institution. In recent years, GS residents at our institution expressed discontentment with weekly didactics and were not meeting their goals on the American Board of Surgery In-Training Examination (ABSITE). We sought to develop improvements in our didactic curriculum to increase resident satisfaction and ABSITE scores of GS junior residents (Jrs). In a quality improvement project, we changed the weekly didactic curriculum format from hour-long lectures in the 2018 to 2019 academic year (AY) to a partially-flipped classroom in the 2019 to 2020 AY, involving a 30-minute faculty-led presentation followed by 30 minutes of resident-led practice questions. The outcomes measured were ABSITE scores taken in 2019 and 2020 and resident opinions via an anonymous survey. This study was conducted at the University of Minnesota (Minneapolis, MN). The cohort for this study included all GS Jrs in our GS residency program, including postgraduate year (PGY) 1 nondesignated preliminary, PGY1 to 3 categorical GS residents, and residents in their lab time. Senior residents attended a separate didactics session. After curriculum changes, the ABSITE percentile scores for GS Jrs rose from 52% ± 5% to 66% ± 4% (p = 0.03). No categorical GS Jr scored <30% in 2020, compared to 20% (6/30) of categorical General Surgery residents in 2019. All residents preferred the new format overall and reported greater engagement in and preparation for didactics. After changing didactic education from hour-long lectures in the 2018 to 2019 AY to a flipped classroom model in the 2019 to 2020 AY including 30 minutes of faculty-led lecture followed by 30 minutes of resident-led practice questions, ABSITE scores and resident satisfaction at the University of Minnesota General Surgery Program improved.

Per- and polyfluoroalkyl substances (PFAS), perceived stress, and depressive symptoms in a prospective cohort study of black women

BackgroundPer- and polyfluoroalkyl substances (PFAS) are endocrine-disrupting chemicals with neurotoxic properties. PFAS have been associated with depressive symptoms among women in some studies, but little research has evaluated the effects of PFAS mixtures. Further, no study has investigated interactions of PFAS-depression associations by perceived stress, which has been shown to modify the effects of PFAS on other health outcomes. ObjectiveIn a prospective cohort study of reproductive-aged Black women, we investigated associations between PFAS and depressive symptoms and the extent to which perceived stress modified these associations. MethodsWe analyzed data from 1499 participants (23-35 years) in the Study of Environment, Lifestyle, and Fibroids. We quantified concentrations of nine PFAS in baseline plasma samples using online solid-phase extraction-liquid chromatography-isotope dilution tandem mass spectrometry. Participants reported perceived stress via the Perceived Stress Scale (PSS-4; range = 0-16) at baseline and depressive symptoms via the Center for Epidemiologic Studies Depression Scale (CESD; range = 0-44) at the 20-month follow-up visit. We used Bayesian Kernel Machine Regression to estimate associations between PFAS concentrations, individually and as a mixture, and depressive symptoms, and to assess effect modification by PSS-4 scores, adjusting for confounders. ResultsBaseline perfluorodecanoic acid concentrations were associated with greater depressive symptoms at the 20-month follow-up, but associations for other PFAS were null. The PFAS were not associated with depressive symptoms when evaluated as a mixture. The association between the 90th percentile (vs. 50th percentile) of the PFAS mixture with CES-D scores was null at the 10th (β = 0.03; 95 % CrI = 0.20, 0.25), 50th (β = 0.02; 95 % CrI = -0.16, 0.19), and 90th (β = 0.01; 95 % CrI = 0.18, 0.20) percentiles of PSS-4 scores, suggesting perceived stress did not modify the PFAS mixture. ConclusionIn this prospective cohort study, PFAS concentrations—assessed individually or as a mixture—were not appreciably associated with depressive symptoms, and there was no evidence of effect modification by perceived stress.

Beyond normalized gain: Improved comparison of physics educational outcomes

This study proposes methods of reporting results of physics conceptual evaluations that more fully characterize the range of outcomes experienced by students with differing levels of prior preparation, allowing for more meaningful comparison of the outcomes of educational interventions within and across institutions. Factors leading to variation in post-test scores on the Force and Motion Conceptual Evaluation (FMCE) across different instructors, semesters, and course models in a sample collected in introductory calculus-based mechanics at a large, eastern land-grant university were examined. The sample was collected over nine years and contains a total of N=4409 matched pretest and post-test records. The data showed a systematic semester-by-semester variation in both pretest scores and ACT or SAT mathematics percentile scores. Neither the normalized gain nor Cohen’s d removed the semester-to-semester variation observed in post-test scores. The local average curve plotting post-test scores against pretest scores, which we call a conceptual growth curve, allowed for the characterization of outcomes for students with different pretest scores. Regression models were used to produce an approximation to this curve. By using either the full curve or a mathematical approximation developed through linear regression, the post-test score that would be observed if a class enrolled students with a given level of prior preparation measured by pretest scores can be predicted. This predicted post-test score can then be used to calculate the predicted normalized gain if desired. These methods rely on using the natural variation of incoming student preparation at one institution to predict how a class would perform if it enrolled students with different prior preparation. The study presents an example of converting the outcomes at an institution with a weakly prepared student population to the outcomes which would have been observed if the course enrolled a more prepared student population; converting the outcomes for a different student population dramatically changed the interpretation of how the class studied was functioning. Published by the American Physical Society 2024

A comparative study on fundamental movement skills among children with autism spectrum disorder and typically developing children aged 7-10.

Autism Spectrum Disorder (ASD) is a neurodevelopmental condition with unique differences in social interaction, communication, and a spectrum of behavioral characteristics. In the past, motor disturbance in individuals with ASD has not been considered a significant core deficit due to the predominant focus on sociability and communication issues. However, recent studies indicate that motor deficits are indeed associated with the fundamental symptoms of ASD. As there is limited research on the motor behavior of children with ASD, particularly in China, the objective of this study is to investigate the development of fundamental movement skills (FMS) in children with ASD and compare them to typically developing children. The study recruited 108 children with ASD (87 boys, 21 girls) aged 7-10 years from two special education rehabilitation centers in Wuhan, China. For comparison, a control group of 108 typically developing children, matched by age and gender, was randomly selected from three local primary schools. FMS were assessed using the Movement Assessment Battery for Children - Second Edition (MABC-2), which evaluates manual dexterity, aiming and catching, as well as static and dynamic balance. Group differences on MABC-2 percentile scores were analyzed using descriptive statistics and Mann-Whitney U test. Effect sizes were also calculated for practical significance. Findings from the study showed that a significant majority, around 80%, of children with ASD either displayed motor challenges or were at risk of developing such delays. When comparing to their typically developing peers, children with ASD scored notably lower in areas of manual dexterity, ball skills, and both static and dynamic balance (with all these findings being statistically significant at p < 0.001). Interestingly, gender did not show a significant influence on these results (p > 0.05). In addition to addressing the other skill development areas outlined in the diagnostic manual for ASD, clinicians diagnosing and treating children with ASD should also assess the presence of motor skill development. For individuals with ASD who have co-existing motor difficulties, it is essential to offer evidence-based interventions tailored to their specific needs.