Population-based Retrospective Cross-sectional Study Research Articles

#1536 Serum soluble LYVE1 is a promising non-invasive biomarker of renal fibrosis: a population-based retrospective cross-sectional study

Abstract Background and Aims Diagnosis of renal fibrosis can only be verified by kidney biopsy, but biomarkers for non-invasive evaluation remain unsatisfactory. Patients with fibrosis often have abnormalities of the lymphatic vascular system and associated immune function. We describe here a lymphatic marker as a candidate biomarker for fibrosis. Method After assessing and grading the fibrosis scores, testing serum soluble lymphatic vessel endothelial hyaluronan receptor1 (sLYVE1) level, and collecting clinical information, the association between sLYVE1 and renal fibrosis was analyzed. Logistic regression analysis was used to screen variables. Diagnosis models with or without sLYVE1 were built, and nomograms were plotted. Calibration curve, C-index, and DCA were performed to assess the models. Results A total of 298 patients were enrolled in the study, of which 199 were included in the training cohort and 99 patients in the validation cohort. Serum sLYVE1 levels markedly elevated with increasing fibrosis grade (p < 0.05). ROC analysis of sLYVE1 showed an AUC of 0.791 and 0.846 with optimal cut-off value of 405.25 ng/mL and 498.55 ng/mL for the prediction of moderate-to-severe renal fibrosis (MSF) and severe renal fibrosis (SF), respectively (Fig. 1). The diagnostic nomogram model without sLYVE1 (model 1) included traditional clinical determinants (C-index: 0.658 for MSF; 0.603 for SF). A combination of model 1 and sLYVE1 (model 2) improved predictive performance (C-index: 0.847 for MSF; 0.856 for SF) (Figs 2 and 3). Calibration curve and DCA demonstrated a better consistency accuracy and clinical benefit of model 2 than model 1. Conclusion Serum sLYVE1 may be identified as a potential biomarker of renal fibrosis. Models incorporating sLYVE1 may be beneficial for a more accurate non-invasive diagnosis of renal fibrosis.

Hospital admissions for physical health and psychosocial adversity among people experiencing homelessness in England: a population-based retrospective cross-sectional study

BackgroundHomeless health care is often characterised by physical health, mental health, and substance use problems, resulting in high use of emergency care, poor outcomes, and extreme social inequities. We assessed health needs as prevention opportunities for hospitalised people experiencing homelessness (PEH) in England. MethodsThis population-based retrospective cross-sectional study used anonymised national Hospital Episodes Statistics Admitted Patient Care data. PEH were identified as having at least one homeless code (“no fixed abode”, “registered with a homeless-exclusive GP practice”, “clinical diagnosis of homelessness”) from April 1, 2017, to March 31, 2018. We analysed admissions for PEH and for housed people. We estimated the prevalence of demographic and admission characteristics and diagnoses by 10th International Classification of Disease (ICD-10) chapter. We developed novel diagnostic phenotypes for physical health (internal disease processes) and psychosocial adversity (mental health, substance use, violence, and social factors). We compared admissions between PEH and housed people using sex-stratified logistic regression adjusted for age and ethnicity. FindingsThere were 15 566 010 admissions (51 643 PEH and 15 514 367 housed people). Compared with housed people, proportionately more PEH were younger (PEH aged 26–45 years, n=24 224 [46·9%], housed people n=3 323 951 [21·4%]), male (PEH n=37 662 [72·9%], housed people n=6 819 157 [44·0%]), and not White British (PEH n=14 605 [28·3%], housed people n=3 447 183 [22·2%]). Emergency admissions were more common among PEH (PEH male n=30 958 [82·2%], housed people male n=5 321 428 [34·3%], adjusted odds ratio [aOR] 8·76, 95% CI 8·53–9·00). The most common primary diagnoses by ICD-10 chapter for PEH were mental and behavioural conditions (PEH male n=7118 admissions [18·9%], housed people male n=155 144 [1·0%], 12·97, 12·61–13·34). Admissions for the psychosocial adversity phenotype were higher in PEH, particularly for women (PEH female n=3922 [28·1%], housed people female n=155 644 [1·79%], 18·18, 17·50–18·88). Physical health phenotype admissions were less common in PEH (PEH male n=7510 [19·9%], housed people male n=1 821 397 [26·7%], 0·91, 0·89–0·94), but specific infections, cancers, respiratory, and cardiovascular diseases were more common among PEH for both men and women. InterpretationThese results support targeting of preventative interventions for PEH before, during and after admission to hospital, highlighting psychosocial needs. Future research should aim to produce reliable estimates of the size of the national homeless population to enable calculation of admission rates for psychosocial and physical health diagnoses. FundingNational Institute for Health and Care Research (NIHR).

Exploring comorbidity and pharmacological treatment patterns in psoriasis - a retrospective population-based cross-sectional study.

Individuals with psoriasis face an increased risk of suffering from various comorbid conditions. However, there haven´t been any studies conducted in Sweden to examine the frequency of comorbidities and the corresponding treatment for these conditions among psoriasis patients. The Cosmic electronic medical record represents a comprehensive repository of medical information including all residents of Region Jönköping. To conduct a population-based retrospective cross-sectional study, all individuals diagnosed with psoriasis between April 9, 2008 and July 1, 2016, were identified via the electronic medical records using ICD-10 codes. Data on comorbidity and dispensation of prescribed drugs against these comorbid conditions were analyzed. During the study period, 1.7% of the population (4,587 individuals) were diagnosed with psoriasis, with 74.3% of cases classified as mild to moderate psoriasis and 25.7% as severe. The remaining 268,949 individuals did not receive a psoriasis diagnosis. The study showed that psoriasis patients had higher odds of experiencing the majority of the comorbid conditions examined. Arthritis other than psoriasis arthritis was found to be the most prevalent comorbid diagnosis among psoriasis patients (adjusted OR 7.2, CI 95% 6.4-8.2, p < 0.001), followed by obesity (OR 2.4, CI 95% 1.9-3.1, p < 0,001). There was no significant difference in drug prescription for comorbid diseases between patients with psoriasis and patients without psoriasis except for arthritis and smoking cessation treatment. Individuals with psoriasis are more susceptible to experiencing multiple comorbid conditions compared to the general population, particularly those with severe psoriasis. There is no evidence of undertreatment of comorbidity except for arthritis among psoriasis patients.

Population-based analysis of the epidemiology of the surgical correction of hyperhidrosis in 1,216 patients over 11 years: a cross-sectional study.

Endoscopic thoracic sympathectomy is the definitive surgical treatment for hyperhidrosis and a nationwide study has suggested that cultural and socioeconomic factors play a role in the numbers of operations performed. Thus, there is a need to evaluate local data in order to understand the local epidemiology and trends in hyperhidrosis treatment. To study the epidemiology of sympathectomy for treating hyperhidrosis in São Paulo, the largest city in Brazil. Population-based retrospective cross-sectional study. Data on sympathectomies for treating hyperhidrosis between 2008 and 2018 were assessed from the database of the Municipal Health Department of São Paulo, Brazil. 65.29% of the patients were female, 66.2% were aged between 20 and 39 years and 37.59% had registered with addresses outside São Paulo. 1,216 procedures were performed in the city of São Paulo from 2008 to 2018, and 78.45% of them were in only two public hospitals. The number of procedures significantly declined over the years (P = 0.001). 71.63% of the procedures were associated with 2-3 days of hospital stay, only 78 intensive care unit days were billed and we did not observe any intra-hospital death. The profile of patients operated on in São Paulo (young women) is similar to that described in other populations. Sympathectomy is a very safe procedure, with no mortality in our series. There was a decreasing trend in the number of surgeries over the years.

Chronic Spontaneous Urticaria in Patients With Interstitial Cystitis/Bladder Pain Syndrome: Insights From Big Data Analyses

ObjectiveTo examine the association between chronic spontaneous urticaria (CSU) and interstitial cystitis/bladder pain syndrome (IC/BPS). MethodsA population-based retrospective cross-sectional study was performed using the Clalit Health Services medical database. The prevalence of CSU was compared between patients diagnosed with IC/BPS and age- and gender-matched controls. Univariate analysis was performed using Chi-square and Student t test and a multivariable analysis was performed using a logistic regression model. ResultsThe study included 681 patients with IC/BPS and 3376 demographically matched controls. The mean age of IC/BPS patients was 60 years old. The prevalence of CSU among patients with IC/BPS was higher as compared to the control group (20% vs 13.7%; P <.001). The adjusted OR for CSU in patients with IC/BPS was 1.58 (95% CI 1.28-1.97). Female gender and Jewish ethnicity were associated with the coexistence of these disorders (OR 1.7 95% CI 1.36-2.13, and 1.6 95% CI 1.28-2, respectively). ConclusionA significant association was found between IC/BPS and CSU. This finding may support the presence of allergic/immune components in the pathogenesis of IC/BPS.

Patterns of prescription opioid dispensing among Red River Métis in Manitoba, Canada: a retrospective longitudinal cross-sectional study.

Background:Amid rising concern about opioid use across Canada, Métis leaders in Manitoba are seeking information on prescription opioid dispensing in Red River Métis populations to assist with planning and implementing appropriate evidence-based harm-reduction strategies in their communities. We examined patterns of prescription opioid dispensing among Red River Métis and compared them to those among other residents of Manitoba.Methods:We conducted a population-based retrospective cross-sectional study for fiscal years 2006/07–2018/19 using administrative data from the Manitoba Population Research Data Repository and a study designed in partnership with researchers from the Manitoba Métis Federation. We compared age- and sex-adjusted rates of prescription opioid dispensing and mean morphine equivalents (MEQ) between Red River Métis and all other Manitobans aged 10 years or older, in accordance with Indigenous data sovereignty principles. To better understand what was driving any differences in patterns of prescription opioid dispensing between the 2 groups, we stratified the groups by age, sex, urbanicity, number of comorbidities, income quintile and opioid type, and compared patterns in MEQ/person.Results:The 2018/19 cohort included 76 755 Red River Métis and 1 117 854 other Manitobans. Other Manitobans were more likely than Red River Métis to be in higher income quintiles and to live in urban areas, and were less likely to have been diagnosed with a mood or anxiety disorder or a substance use disorder in the previous 5 years. The rate of prescription opioid dispensing and the opioid-associated MEQ/person were consistently higher among Red River Métis than among other Manitobans in each study year (p < 0.001). The rate of prescription opioid dispensing declined and the MEQ/person rose among other Manitobans over the study period but did not change among Red River Métis.Interpretation:The rate of prescription opioid dispensing and the potency of prescribed opioids were higher among Red River Métis in Manitoba than among other Manitobans. Further investigation into the different dispensing patterns between the 2 groups and the potential opioid-related harms they may herald is warranted.

More people more active, but there is a counter site. Novice athletes are at highest risk of injury in a large population-based retrospective cross-sectional study

ObjectivesTo evaluate whether in fitness-related activities and recreational running over time, there is an increase in the number of novice sports athletes and whether these novice athletes have an increased...

What can GP data tell us about the treatment of onychomycosis in the UK?

BackgroundTreatment of onychomycosis is challenging, and there is much literature on optimal treatment strategies. In contrast, information on how onychomycosis is actually treated in primary care is scarce. Information on practice is important as it can reveal much, such as, to what extent national guidelines are followed and which population groups seek/receive treatment or do not do so.ObjectivesTo describe the pattern of onychomycosis treatment in primary care in the UK, by patient's gender and age.MethodsA population‐based retrospective cross‐sectional study was conducted. The Health Improvement Network (THIN) database was used to calculate incidence rates of onychomycosis in the years 2001–2017. The prescription of oral and topical anti‐fungal drugs to patients with onychomycosis was reviewed.ResultsTHIN data showed an onychomycosis incidence rate of about 50 per 100,000. More males than females (52% vs. 48%), and more people aged 50–59 years had received treatment for onychomycosis. Oral terbinafine was the most commonly prescribed drug, followed by topical amorolfine, although terbinafine was used more commonly by men and amorolfine by women. Patients with onychomycosis were also prescribed other antifungals, including itraconazole, griseofulvin, tioconazole, ketoconazole shampoo, fluconazole and clotrimazole. A greater proportion of women, compared to men, were prescribed fluconazole.ConclusionsOnychomycosis treatment in primary care in the UK is broadly in concordance with national guidelines.

Applying resolved and remission codes reduced prevalence of multimorbidity in an urban multi-ethnic population

ObjectiveTo estimate the prevalence and determinants of multimorbidity in an urban, multi-ethnic area over 15-years and investigate the effect of applying resolved/remission codes on prevalence estimates. Study design and settingThis is a population-based retrospective cross-sectional study using electronic health records of adults registered between 2005 –2020 in general practices in one inner London borough (n = 826,936). Classification of resolved/remission was based on clinical coding defined by the patient's general practitioner. ResultsThe crude and age-adjusted prevalence of multimorbidity over the study period were 21.2% (95% CI: 21.1 –21.3) and 30.8% (30.6 –31.0), respectively. Applying resolved/remission codes decreased the crude and age-adjusted prevalence estimates to 18.0% (95% CI: 17.9 –18.1) and 27.5% (27.4 –27.7). Asthma (53.2%) and depression (20.2%) were responsible for most resolved and remission codes. Substance use (Adjusted Odds Ratio 10.62 [95% CI: 10.30 –10.95]), high cholesterol (2.48 [2.44 –2.53]), and moderate obesity (2.19 [2.15 –2.23]) were the strongest risk factor determinants of multimorbidity outside of advanced age. ConclusionOur study highlights the importance of applying resolved/remission codes to obtain an accurate prevalence and the increased burden of multimorbidity in a young, urban, and multi-ethnic population. Understanding modifiable risk factors for multimorbidity can assist policymakers in designing effective interventions to reduce progression to multimorbidity.

Association of Benzodiazepine Receptor Agonist Use With Changes in Psoriasis Severity in Adult Population: A Population-Based Study.

To date, it remains uncertain whether benzodiazepine receptor agonists (BZRAs) are aggravating factors even though these drugs can elevate the levels of biomarkers associated with the development of psoriasis. Therefore, this study aimed to investigate the association of BZRA use with changes in psoriasis severity. All data were sourced from the National Health Insurance system in Taiwan. We conducted a population-based retrospective cross-sectional study of 15,727 psoriasis patients who received BZRAs (BZRA users), and 18,856 psoriasis patients who did not receive BZRAs (nonusers). At least a 1-year washout period without any BZRA prescriptions was required. The main outcome was the change in psoriasis severity between before and after BZRA exposure. This study detected the exacerbation of psoriasis severity in mild psoriasis population by using a logistic model. Then, this study carried another logistic model among those patients who had severe psoriasis to calculate the odds ratios (ORs) for the improvement of the psoriasis severity. Among patients with mild psoriasis, BZRA users had a significantly higher probability of psoriasis severity exacerbation (IPTW-adjusted OR = 1.46). Mild psoriasis patients who received high and low doses of BZRAs had 1.70- and 1.39-fold higher probabilities of psoriasis severity exacerbation, respectively, than the non-users. Furthermore, in the severe psoriasis population, more low-dose BZRA users improved psoriasis severity than non-users. In conclusion, this study provided clinical evidence of the effects of BZRA use on patients with psoriasis severity. Among patients with mild psoriasis, high-dose BZRA users may be associated with the changes in psoriasis severity. However, low-dose BZRA exposure only slightly exacerbated disease severity among patients with mild psoriasis. Accordingly, clinicians should evaluate the risks and benefits of the BZRA usage.

Identifying longitudinal clusters of multimorbidity in an urban setting: A population-based cross-sectional study.

BackgroundGlobally, there is increasing research on clusters of multimorbidity, but few studies have investigated multimorbidity in urban contexts characterised by a young, multi-ethnic, deprived populations. This study identified clusters of associative multimorbidity in an urban setting.MethodsThis is a population-based retrospective cross-sectional study using electronic health records of all adults aged 18 years and over, registered between April 2005 to May 2020 in general practices in one inner London borough. Multiple correspondence analysis and cluster analysis was used to identify groups of multimorbidity from 32 long-term conditions (LTCs).ResultsThe population included 41 general practices with 826,936 patients registered between 2005 and 2020, with mean age 40 (SD15·6) years. The prevalence of multimorbidity was 21% (n = 174,881), with the median number of conditions being three and increasing with age. Analysis identified five consistent LTC clusters: 1) anxiety and depression (Ratio of within- to between- sum of squares (WSS/BSS <0·01 to <0·01); 2) heart failure, atrial fibrillation, chronic kidney disease (CKD), chronic heart disease (CHD), stroke/transient ischaemic attack (TIA), peripheral arterial disease (PAD), dementia and osteoporosis (WSS/BSS 0·09 to 0·12); 3) osteoarthritis, cancer, chronic pain, hypertension and diabetes (0·05 to 0·06); 4) chronic liver disease and viral hepatitis (WSS/BSS 0·02 to 0·03); 5) substance dependency, alcohol dependency and HIV (WSS/BSS 0·37 to 0·55).InterpretationMental health problems, pain, and at-risk behaviours leading to cardiovascular diseases are the important clusters identified in this young, urban population.FundingImpact on Urban Health, United Kingdom.

Practice variation in bilateral salpingo-oophorectomy at benign abdominal hysterectomy: a population-based study

Bilateral salpingo-oophorectomy at benign hysterectomy is not recommended in premenopausal women who are in the premenopausal stage because of its potential associations with increased all-cause mortality and cardiovascular disease; however, contemporary practice patterns are unknown. This study aimed to quantify between-surgeon variation in bilateral salpingo-oophorectomy and identify surgeon and patient characteristics associated with bilateral salpingo-oophorectomy to evaluate current quality of care and identify targets for knowledge translation and future research. We conducted a population-based retrospective cross-sectional study of adult women (≥20 years) undergoing benign abdominal hysterectomy from 2014 to 2018 in Ontario, Canada. Hierarchical multivariable logistic regression models, stratified by age group (<45, 45-54, ≥55 years), were used to model between-surgeon variation after multivariable adjustment for patient and surgeon characteristics. Cases of bilateral salpingo-oophorectomy were classified as potentially appropriate or potentially avoidable based on the presence or absence of diagnostic indications. Of 44,549 eligible women, 17,797 (39.9%) underwent concurrent bilateral salpingo-oophorectomy, and 26,752 (60.1%) did not. In all three age strata, the individual surgeon providing care was one of the strongest factors influencing whether patients received bilateral salpingo-oophorectomy (median odds ratio, 2.00-2.53). Surgeons accounted for more than 22% of the residual observed variation in bilateral salpingo-oophorectomy in women aged 45-54 years compared with 16% and 14% of the residual observed variation in bilateral salpingo-oophorectomy in women aged <45 and ≥55 years, respectively. Non-gynecologic patient factors, such as obesity (odds ratio, 1.33; 95% confidence interval, 1.17-1.52; P<.001) and residing in low-income regions (odds ratio, 1.34; 95% confidence interval, 1.16-1.55; P<.001), were also associated with bilateral salpingo-oophorectomy. Approximately 40% of patients who underwent bilateral salpingo-oophorectomy had no indication for the procedure in their discharge records. Marked between-surgeon variation in bilateral salpingo-oophorectomy rates, even after adjusting for patient case mix, suggests ongoing uncertainty in practice. Stronger evidence-based guidelines on the risks and benefits of salpingo-oophorectomy as women age are needed, particularly focusing on perimenopausal women.

Distributional Validity and Prognostic Power of the National Institutes of Health Stroke Scale in US Administrative Claims Data

Comparative assessment of acute ischemic stroke care quality provided by hospitals in the United States has been hampered by the unavailability of the National Institutes of Health Stroke Scale (NIHSS) in administrative data sets, preventing adequate adjustment for variations in patient case-mix risk. In response to stakeholder concerns, the US Centers for Medicare & Medicaid Services in 2016 implemented optional reporting of NIHSS scores. To analyze the distributional, convergent, and predictive validity of nationally submitted NIHSS values in the National Inpatient Sample. This population-based retrospective cross-sectional study took place from October 1 to December 31, 2016. The nationally representative sample included US adults who had ischemic stroke hospitalizations during the first calendar quarter in which optional NIHSS reporting was implemented. Analysis began September 2019. Distribution of NIHSS scores, functional independence at discharge, inpatient mortality, and administrative reporting of NIHSS. Among 154 165 ischemic stroke hospitalizations during the first 3 months of the reporting policy, NIHSS scores were reported in 21 685 patients (14%) (10 925 women [50.4%]; median [interquartile range] age, 72 [61-82] years). Median (interquartile range) NIHSS score was 4 (2-11), and frequency of severity categories included absent (NIHSS score, 0) in 2080 patients (9.6%), minor (NIHSS score, 1-4) in 8760 patients (40.4%), and severe (NIHSS score, 21-42) in 1930 patients (8.9%). National Institutes of Health Stroke Scale score of 10 or more, an indicator of possible large vessel occlusions, was present in 6290 patients (29%). Presenting NIHSS score was higher in very elderly patients (age ≥80 y) and women and also in patients receiving endovascular thrombectomy vs intravenous thrombolysis alone vs no reperfusion therapy (median [interquartile range], 17 [12-22] vs 6 [4-12] vs 4 [2-9], respectively) (P < .001). National Institutes of Health Stroke Scale scores were similarly higher for discharge outcomes of mortality vs discharge to skilled nursing facility vs discharge home (median [interquartile range], 19 [12-25] vs 7 [3-15] vs 2 [1-5], respectively) (P < .001). Likelihood of NIHSS scores being reported independently increased with interfacility transfer, receipt of acute reperfusion therapies, larger hospital size, academic centers, and region other than the West. In the initial national optional reporting period in the United States, NIHSS scores were reported in nearly 1 in 7 ischemic stroke hospitalizations. The distribution of NIHSS scores was similar to that from narrow population-based studies and registries, and NIHSS scores were powerfully associated with discharge outcome, supporting the validity and potential to aid care quality assessment.

The Relationship between Platelet Count and Host Gut Microbiota: A Population-Based Retrospective Cross-Sectional Study.

Platelet count reflects the severity and prognosis of multiple diseases. Additionally, alterations in gut microbiota have been linked to several chronic diseases. The purpose of this study was to investigate the association between gut microbiota and platelet count. We selected 1268 subjects with fecal 16S RNA gene sequencing data from a Healthcare Screening Center cohort. Based on the third quartile of platelets (277 × 109/L), we compared the gut microbiota between the upper quartile (n = 321) and lower three quartiles groups (n = 947). The upper quartile group had lower alpha diversity based on observed amplicon sequence variants (q = 0.004) and phylogenetic index (q < 0.001) than the lower three quartiles group. Significant differences were also found in the weighted UniFrac distance (q = 0.001) and Jaccard dissimilarity (q = 0.047) beta diversity measures between the two groups. Compared with the lower three quartiles group, the upper quartile group exhibited decreased relative abundances of the genus Faecalibacterium, which was also inversely correlated with the platelet count. Increased platelet count was associated with reduced diversity in gut microbiota and lower abundances of Faecalibacterium with beneficial gut bacteria spices F. prausnitzii, suggesting that an increased platelet count, even within normal range, may adversely affect gut microbial diversity and composition.

Reference Intervals of Thyroid Hormones and Correlation of BMI with Thyroid Function in Healthy Zhuang Ethnic Pregnant Women.

Ethnic differences in the level of thyroid hormones exist among individuals. The American Thyroid Association (ATA) recommends that an institution or region should establish a specific thyroid hormone reference value for each stage of pregnancy. To date, a limited number of studies have reported the level of thyroid hormones in Chinese minorities, and the exact relationship between BMI and thyroid function in pregnant women is ill. This study was performed to establish trimester-specific reference ranges of thyroid hormones in Zhuang ethnic pregnant women and explore the role of body mass index (BMI) on thyroid function. A total of 3324 Zhuang ethnic health pregnant women were recruited in this Zhuang population-based retrospective cross-sectional study. The values of thyroid stimulating hormone (TSH), free thyroxine (FT4), and free triiodothyronine (FT3) were determined by automatic chemiluminescence immunoassay analyzer. Multivariate linear regression and binary logistic regression were constructed to evaluate the influence of BMI on the thyroid function. The established reference intervals for the serum thyroid hormones in three trimesters were as follows: TSH, 0.02–3.28, 0.03–3.22, and 0.08-3.71 mIU/L; FT4, 10.57–19.76, 10.05–19.23, and 8.96–17.75 pmol/L; FT3, 3.51–5.64, 3.42–5.42, and 2.93–5.03 pmol/L. These values were markedly lower than those provided by the manufacturers for nonpregnant adults which can potentially result in 6.10% to 19.73% misclassification in Zhuang pregnant women. Moreover, BMI was positively correlated with isolated hypothyroxinemia (OR=1.081, 95% CI=1.007–1.161), while the correlation between the BMI and subclinical hypothyroidism was not statistically significant (OR=0.991, 95% CI=0.917–1.072). This is the first study focusing on the reference ranges of thyroid hormones in Guangxi Zhuang ethnic pregnant women, which will improve the care of them in the diagnosis and treatment. We also found that high BMI was positively associated with the risk of isolated hypothyroxinemia.

The Relationship between Platelet Count and Host Gut Microbiota: A Population-Based Retrospective Cross-Sectional Study

Platelet count reflects the severity and prognosis of multiple diseases. Additionally, alterations in gut microbiota are also linked to several chronic diseases. The purpose of this study was to investigate the association between gut microbiota and platelet count. We selected 1,268 subjects with fecal 16S RNA sequencing data from a Healthcare Screening Center cohort. Based on the third quartile of platelets (277 x 109/L), we compared the gut microbiota between the upper quartile (n=321) and lower three quartile groups (n=947). The upper quartile group had lower diversity indexes based on observed OTUs (84.5 ± 44.1 [upper] vs. 92.3 ± 43.9 [lower], q=0.004) and phylogenetic diversity (13.9 ± 3.3 vs. 14.6 ± 3.5, q<0.001) than the lower three quartiles group. Significant differences were also found in the weighted UniFrac (q=0.001) and Jaccard (q=0.047) beta diversity measures between the two groups. Compared with the lower quartiles group, the upper quartile group had decreased relative abundances of the family Ruminococcaceae, the genus Faecalibacterium, and the species Faecalibacterium prausnitzii, which also inversely correlated with the platelet count. Increased platelet count was associated with reduced diversity in gut microbiota and lower abundances of beneficial bacteria such as F. prausnitzii, suggesting that an increased platelet count even in the normal range may adversely affect gut microbial diversity and composition. Funding Statement: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2016R1A6A3A11932719), the Ministry of Science and ICT (NRF-2018R1D1A1B07050067). The study was also supported by an NRF grant funded by the Korean government (MSIT) (2010-0027945). Declaration of Interests: The authors have no conflicts of interest to declare. Ethics Approval Statement: Demographic data, laboratory findings, and past medical and diet histories were retrospectively reviewed through medical records and questionnaires taken at the time of sample collection. This study was approved by the Institutional Review Board of Kangbuk Samsung Hospital (KBSMC 2013- 01-245-12) and written informed consent was provided by all subjects.

Predictors of non-adherence to colorectal cancer screening among immigrants to Ontario, Canada: a population-based study

Though colorectal cancer (CRC) screening rates have increased over time in Ontario, Canada, immigrants continue to have lower rates of screening. This study examines the association between non-adherence to CRC screening and immigration, socio-demographic, healthcare utilization, and primary care physician characteristics among immigrants to Ontario. This is a population-based retrospective cross-sectional study that uses healthcare administrative databases housed at the Institute for Clinical Evaluative Sciences. Our cohort comprised immigrants aged 60 to 74 years who lived in Ontario on March 31, 2015 and who had been eligible for the Ontario Health Insurance Plan for at least 10 years. The outcome was lack of adherence to CRC screening with any modality (fecal occult blood test, flexible sigmoidoscopy, colonoscopy) on March 31, 2015. Our cohort contained 182,949 immigrants. Overall 70,134 (38%) individuals were not adherent to screening. Risk of non-adherence to CRC screening was higher among immigrants who were from low (adjusted relative risk [ARR] 1.35, 95%CI 1.28–1.42) or low-middle (ARR 1.27, 95%CI 1.24–1.30, population-attributable risk [PAR] 9.8%) income countries and refugees (ARR 1.09, 95%CI 1.06–1.11). Compared to those from the United States, Australia, and New Zealand, immigrants from most other world regions, particularly Eastern Europe and Central Asia (ARR 1.28, 95%CI 1.21–1.37), had higher risks of non-adherence. Non-immigration factors such as low healthcare use and lack of primary care enrolment also increased the risk of non-adherence to screening. These findings can be used to inform future efforts to improve uptake of CRC screening among immigrant groups.

Social and Geographic Determinants of Hysterectomy in Ontario: A Population-Based Retrospective Cross-Sectional Analysis

ObjectivesThis study sought to determine whether social factors (neighbourhood education and income) and geographic factors (urban or rural dwelling and local service area) are associated with hysterectomy rates, proportion of hysterectomies performed minimally invasively, and hysterectomy complication and readmission rates in Ontario. MethodsThe Canadian Institute for Health Information Discharge Abstract Database was used to perform a population-based retrospective cross-sectional study on women who had an abdominal, vaginal, and laparoscopic hysterectomy in 2007 for benign gynaecologic conditions in hospitals in Ontario, Canada. Crude and age-standardized rates of hysterectomy, proportion of hysterectomy performed minimally invasively (vaginal or laparoscopic), and rates of surgical complications were analyzed by neighbourhood educational attainment, neighbourhood income, rural or urban residency, and health service delivery area (Canadian Task Force Classification of Study Design II). ResultsA total of 13 511 women who underwent hysterectomy were included. Age-standardized hysterectomy rates were higher for the lowest neighbourhood educational quartile compared with the highest (relative risk [RR] 1.49; 95% CI 1.39–1.60), higher with rural compared with urban dwelling (RR 1.54; 95% CI 1.47–1.61), varied with local health service delivery area (Local Health Integration Network [LHIN]) (range 133.4–439.5 per 100 000 women), and also varied non-linearly with neighbourhood income quintile. Proportion of hysterectomies performed minimally invasively did not vary with neighbourhood education or income, were higher for rural compared with urban areas (RR 1.10; 95% CI 1.03–1.19), and varied with LHIN (range 30.0–62.9 per 100 hysterectomies). Surgical complications varied with neighbourhood educational quartile, but not with income or urban or rural residence. ConclusionsConsiderable social and geographic variation exists in rates of hysterectomy in Ontario, whereas only geographic variation is seen in use of minimally invasive routes. Surgical complication rates vary only by neighbourhood education. Such findings suggest inequities in hysterectomy practice in Ontario, and there is a need to evaluate factors influencing patients' decision making, physicians' clinical and surgical practice, and health system policies to help address the observed disparities.

Hyperglycemia and dyslipidemia of Isabela, Galápagos, Ecuador: A pilot study of cardiovascular risk factors in an Isolated Island community.

To evaluate the prevalence of hyperglycemia and dyslipidemia in the population of Isabela, Galápagos, Ecuador, across gender and age (above or below 50). In this population-based retrospective cross-sectional study among individuals in Isabela, Galápagos, Ecuador, demographic and metabolic factors were evaluated based on World Health Organization (WHO) Global Guidelines. The population overall exceeded the WHO guidelines for cardiovascular health. As to be expected, there was significance in the trend of increasing dyslipidemia and hyperglycemia with age except postprandial glucose. In those individuals below the age of 50, 8.0%, 49% and 26% had hyperglycemia, hypercholesterolemia and hypertriglyceridemia, respectively. However, in those above 50, they measured 24%, 68% and 36% respectively, showing a significant increase. Hyperglycemia and dyslipidemia appear to be prevalent in Isabela, Galápagos, Ecuador and this pilot study supports further research into metabolic syndrome and diabetes. Such data may help in healthcare planning and screening to ensure not only timely diagnosis, but prevention. The limitations of this data illustrate modalities that data collection can be improved, such as having a linked clinical history to the data itself and better patient follow up for such entities as post prandial glucose, for example. However, this pilot study presents a starting point for future directions of research, such as ascertaining prevalence of diabetes type II, metabolic syndrome and cardiovascular disease.

Comorbidities in COPD: A Population-based Retrospective Cross-sectional Study

Comorbidities in COPD: A Population-based Retrospective Cross-sectional Study