Test Item Response Research Articles

The HAIR-QoL measure Part 2: Validation of an instrument to measure of the severity and impact of chemotherapy-induced alopecia (CIA)

ObjectiveChemotherapy-induced alopecia (CIA) is one of the most common and distressing side effects related to cancer treatment. Few patient-reported outcome measures (PROMs) have been developed specifically to measure the patient-experience of hair loss during chemotherapy treatment. In part I of this research, a set of provisional questionnaire items were developed for a new tool. This article focusses on the validation and psychometric testing of the CIA-specific scoring items in the provisional HAIR-QoL measure. MethodsThe provisional HAIR-QoL questionnaire, comprised of 43 CIA-specific items, was administered to a large sample of patients (n = 228) from 8 international centres, who were undergoing chemotherapy. Psychometric testing used a combination of Classical Test Theory (CTT) and Item Response Theory methods; Principal Components Analysis (PCA) and Rasch Analysis, respectively. ResultsFrom the initial item pool of 43 items, 28 items satisfied the criteria for inclusion into four components. The four subscales identified were as follows, 1) Concern about change in appearance, 2) Image of self, 3) Preparedness for hair loss and 4) Impact of hair loss on you and others. The results of the quantitative analyses, PCA and Rasch analysis, suggested modest amendment to the number of items to the provisional HAIR-QoL measure. Psychometric properties were reported to be very good/excellent for all four subscales and were found to be sensitive to detecting group differences. ConclusionThe refined items which comprise the final HAIR-QoL measure were found to tap into several important psycho-social domains of concern for patients who experienced CIA. The subscale scores have the potential to inform future decision-making on patients’ unmet information and support needs and pave the way for personalised psychological care and more robust research on efficacy of scalp cooling.

Адаптация на русскоязычной выборке опросника П. О’Коннора, направленного на диагностику энергичности и усталости

<p style="text-align: justify;">The paper describes the results of the adaptation of the questionnaire by Patrick J. O’Connor, Ph.D., aimed at diagnosing Mental and Physical State and Trait Energy and Fatigue (Mental and Physical State and Trait Energy and Fatigue Scales, STEF), as well as provides validity evidence of the Russian version of the tool on а sample of students. The scales allow to separately measure physical and mental aspects of energy and fatigue. 220 students aged from 18 to 25 years old took part in the questionnaire adaptation. The process of adaptation included direct and reverse translation, as well as analysis of the factor structure of the questionnaire using Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA). Psychometric characteristics were analyzed using Classical Test Theory and Item Response Theory (IRT). The CFA demonstrated that after the adaptation the original four-factor structure of the questionnaire became a three-factor one including energy, physical fatigue and mental fatigue for both scales (state and trait scales). The reliability of the questionnaire scales (Cronbach's Alpha) varies from 0.78 to 0.88. A question about races was excluded from the Russian-language version of the questionnaire due to its irrelevance for the native speakers of Russian. The conducted studies confirm the scales validity. The questionnaire can be used for young people aged from 18 to 25.</p>

LexVEN

While there is growing awareness that knowledge of regional minority languages must be protected, assessing the vitality of such varieties is challenging due to the lack of assessment materials. Our contribution documents the creation and validation of LexVEN, a bimodal yes/no vocabulary task, with the purpose of assessing the proficiency of users of Venetan with receptive and/or productive skills. The materials will be freely available. The vocabulary items were validated in a survey with 161 speakers of Italian, of which 136 came from the Veneto area. We have relied on Classical Test Theory (CTT) and Item Response Theory (IRT) in validating test items, and we demonstrate correlations with self-reported measures of proficiency and language use. Given the absence of any other assessment tools of Venetan for cross-validation, we further collected speech samples from a subset of the Venetan participants with active proficiency whose proficiency was rated by native speakers of Venetan. We discuss the procedures within a validation framework, concluding that LexVEN is reliable as a proficiency assessment tool of Venetan.

Application of Item Response Theory as a Modern Statistical Tool to Test Item Development and Analysis

In the educational and psychological testing, there are two major theories through which tests can be developed, validated and ultimately used for assessing examinee’s performance. These are classical test theory (CTT) and item response theory (IRT) and their corresponding models. Item Response Theory (IRT) as a test theory came into existence to provide probabilistic approach to surmount some of the inherent limitations of the classical test theory and maximize objectivity in educational assessment. Item response theory (IRT) is a quantitative approach to testing the reliability and validity of an instrument based on its items. It has statistics for evaluating individual items from a quantitative perspective. The purpose of this paper is to describe in details, the application of item response theory in test item development and analysis. The reason for the application of IRT is to have test items that will yield a reasonable degree of reliability. The statistics used in this respect are – item difficulty parameter, which is a measure of the proportion of testees who responded to an item correctly; the item discrimination parameter, which is the measure of how well the items discriminate between examinees with high and low levels of knowledge or ability and pseudo-guessing parameter, which expresses the probability that an examinee with low ability can be able to get an item correctly. The acceptable range of values of the aforementioned parameters were also discussed.

Behavioral economic analysis of legal and illegal cannabis demand in Spanish young adults with hazardous and non-hazardous cannabis use

BackgroundIn October 2021, a legal framework that regulates cannabis for recreational purposes in Spain was proposed, but research on its potential impacts on cannabis use is currently limited. This study examined the reliability and discriminant validity of two Marijuana Purchase Tasks (MPTs) for measuring hypothetical legal and illegal cannabis demand, and to examine differences in demand of both commodities in young adults at hazardous vs. non-hazardous cannabis use risk levels. MethodsA total of 171 Spanish young adults [Mage = 19.82 (SD = 1.81)] with past-month cannabis use participated in a cross-sectional study from September to November 2021. Two 27-item MPTs were used to estimate hypothetical demand for legal and illegal cannabis independently. The Cannabis Use Disorder Identification Test (CUDIT-R) was used to assess hazardous cannabis use and test for discriminant validity of the MPTs. Reliability analyses were conducted using Classical Test Theory (Cronbach’s alpha) and Item Response Theory (Item Information Functions). ResultsThe MPT was reliable for measuring legal (α = 0.94) and illegal (α = 0.90) cannabis demand. Breakpoint (price at which demand ceases), and Pmax (price associated with maximum expenditure) were the most sensitive indicators to discriminate participants with different levels of the cannabis reinforcing trait. No significant differences between legal and illegal cannabis demand in the whole sample were observed, but hazardous vs. non-hazardous users showed higher legal and illegal demand, and decreased Breakpoint and Pmax if cannabis were legal vs illegal. ConclusionThe MPT exhibits robust psychometric validity and may be useful to inform on cannabis regulatory science in Spain.

The 18-item Swedish version of Ryff's psychological wellbeing scale: psychometric properties based on classical test theory and item response theory.

Psychological wellbeing is conceptualized as the full engagement and optimal performance in existential challenges of life. Our understanding of psychological wellbeing is important for us humans to survive, adapt, and thrive during the challenges of the 21st century. Hence, the measurement of psychological wellbeing is one cornerstone for the identification and treatment of both mental illness and health promotion. In this context, Ryff operationalized psychological wellbeing as a six-dimensional model of human characteristics: self-acceptance, positive relations with others, environmental mastery, personal growth, autonomy, and purpose in life. Ryff's Psychological Wellbeing Scale has been developed and translated into different versions. Here, we examine and describe the psychometric properties of the 18-item Swedish version of Ryff's Psychological Wellbeing Scale using both Classical Test Theory (CTT) and Item Response Theory (IRT). The data used in the present study was earlier published elsewhere and consists of 768 participants (279 women and 489 men). In addition to the 18-item version of the scale, participants answered the Temporal Satisfaction with Life Scale, the Positive Affect Negative Affect Schedule, and the Background and Health Questionnaire. We examined, the 18-item version's factor structure using different models and its relationship with subjective wellbeing, sociodemographic factors (e.g., education level, gender, age), lifestyle habits (i.e., smoking, frequency of doing exercise, and exercise intensity), and health issues (i.e., pain and sleeping problems). We also analyzed measurement invariance with regard to gender. Moreover, as an addition to the existing literature, we analyzed the properties of the 18 items using Graded Response Model (GRM). Although the original six-factor structure showed a good fit, both CTT and IRT indicated that a five-factor model, without the purpose in life subscale, provided a better fit. The results supported the internal consistency and concurrent validity of the 18-item Swedish version. Moreover, invariance testing showed similar measurement precision by the scale across gender. Finally, we found several items, especially the purpose in life's item "I live life one day at a time and do not really think about the future," that might need revision or modification in order to improve measurement. A five-factor solution is a valid and reliable measure for the assessment of psychological wellbeing in the general Swedish population. With some modifications, the scale might achieve enough accuracy to measure the more appropriate and correct six-dimensional theoretical framework as detailed by Ryff. Fortunately, Ryff's original version contains 20 items per subscale and should therefore act as a perfect pool of items in this endeavor.

The organizational trauma resilience assessment: Methods and psychometric properties.

Despite many strengths of trauma-informed care (TIC), critics argue TIC is necessary but alone insufficient, can be deficit focused, lacks construct operationalization, and requires greater inclusion of resilience theory. We sought to address these critiques by creating an assessment tool through an iterative and community-engaged process. We collected cross-sectional data between May and June 2019 with a convenience sample from 12 sites across the United States (N = 861). Data were analyzed through application of classical test theory and item response theory, using principal components analysis. The final 40-item Organizational Trauma Resilience Assessment (OTRA) is sufficiently unidimensional and has a five-factor solution with strong validity and reliability. We believe this instrument marks the first of its kind to synthesize tenets of organizational resilience with TIC principles. Creation of the OTRA progresses the TIC knowledge base and is a cost-effective and valid method for evaluating organizational culture of trauma resilience. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Further Validation of the Social Efficacy and Social Outcome Expectations Scale

The current study sought out to advance the Social Self-Efficacy and Social Outcome Expectations scale using multiple approaches to scale development. Data from 583 undergraduate students were used in two scale development approaches: Classic Test Theory (CTT) and Item Response Theory (IRT). Confirmatory factor analysis suggested a 2-factor structure that aligns with the theoretically based domains for SEOES items and supports previously proposed models of this scale from CTT and psychometric analyses. The IRT analysis indicated that the SEOES items have greater measurement precision at measuring lower levels of the latent constructs. Future research directions are provided and practice implications are discussed.

Psychometric Results of a New Patient-Reported Outcome Measure for Uveal Melanoma Post-Brachytherapy Treatment: The PROM-UM.

The objective of this study was to evaluate the psychometric properties of a new patient-reported outcome instrument intended for use with patients who have undergone brachytherapy for uveal melanoma (PROM-UM). Classical test theory and item response theory were used to evaluate the performance of individual items and domains. A convenience sample of 439 participants who had undergone brachytherapy for uveal melanoma from one of three North American ocular oncology treatment centers were included in this cross-sectional study. Exploratory factor analysis identified three domains which were labelled "Symptom Impairment", "Worry", and "Discomfort". The acceptability of the instrument was supported by little missing data (range = 0.00-1.14%) and low maximum endorsement (range = 0.00-1.82%). Item-total (range = 0.68-0.85) and inter-item (range = 0.74-0.80) correlations indicated acceptable reliability. Discrimination and difficulty were assessed using item response theory. Items in all three domains indicated moderate to very high discrimination (range = 1.00-4.10). Two items in the Symptom Impairment domain were too difficult to measure. Response ranges in the other two domains demonstrated acceptable difficulty. These results from the study indicate that this new patient-reported outcome instrument can be used with patients treated with brachytherapy for uveal melanoma. Providers could use this instrument to help inform post-treatment management.

Psychometric properties of the Coronavirus Anxiety Scale based on Classical Test Theory (CTT) and Item Response Theory (IRT) models among Chinese front-line healthcare workers

BackgroundSince March 2022, the COVID-19 epidemic has rebounded widely and frequently in China. Healthcare workers have faced grand challenges such as soaring COVID-19 patients, being busy with the nucleic acid screening of all the populations in the epidemic areas every day, and testing positive for COVID-19, all of which contributed to anxiety easily according to the Conservation of Resources theory. However, anxiety among healthcare workers is not only associated with personal health but also adversely affects the quality of health services. Therefore, it is crucial to search for suitable tools to monitor the anxiety related to COVID-19 among healthcare workers. The current study aimed to test the Coronavirus Anxiety Scale (CAS) in Chinese healthcare workers.MethodsThe current study employed a cross-sectional design. The CAS was translated into Chinese. Then, according to Classical Test Theory (CTT) and Item Response Theory (IRT) models, the psychometric properties of the Chinese version were measured among 811 healthcare workers.ResultsThe split‐half reliability was 0.855. The Cronbach’s α coefficient was 0.895. The retest coefficient was 0.901 with 10 days as the retest interval. The content validity index was 0.920. In exploratory factor analysis, one common factor was extracted and explained 72.559% of the total variance. All item load values on the common factor ranged from 0.790 to 0.885, and the communality of each item ranged from 0.625 to 0.784. With confirmatory factor analysis, the single factor model showed an excellent goodness-of-fit, chi-square/degree of freedom (χ2/df) = 3.339, goodness of fit index (GFI) = 0.992, adjusted goodness of fit index (AGFI) = 0.975, root-mean-square error of approximation (RMSEA) = 0.054, root mean square residual (RMR) = 0.005, incremental fit index (IFI) = 0.967, Tucker-Lewis index (TLI) = 0.932, and comparative fit index (CFI) = 0.966. The multiple-group confirmatory factor analysis revealed the invariance measuring anxiety of COVID-19 was in similar ways across ages, hospital degrees, and professional titles. With convergent validity, the CAS was positively correlated with post-traumatic stress disorder (r = 0.619, P < 0.001), fear of COVID (r = 0.550, P < 0.001), and depression (r = 0.367, P < 0.001). According to IRT models, the results showed that all item discrimination parameters were higher than 1.70 and difficulty parameters ranged from 1.13 to 2.83.ConclusionThe Chinese version of CAS has good psychometric properties in healthcare workers after China adjusted the COVID-19 management measures during the COVID-19 Omicron epidemic, and can be used for assessing the anxiety associated with COVID-19 in Chinese healthcare workers.

Validation of The Purpose in Life Scale-Short Form in an Ecuadorian Sample: factor analysis, reliability and graded response model

Introduction: The purpose in life is analyzed within psychological well-being, it deals with the meaning of life that people have, which has implications in areas such as mental health. Currently, precise instrumentation is required for its assessment of the Ecuadorian population, which at the moment is limited. Objective: To corroborate the unidimensional structure of the Purpose in Life Scale-Short version (PIL-SF), the equivalence of measurement according to gender, the reliability and the parameters of discrimination and difficulty in a sample of Ecuadorian adults. Methods: Instrumental study of the PIL-SF under the precepts of Classical Test Theory and Item Response Theory. Participants: 743 Ecuadorian adults (64.2% women and 45.8% men) aged 18 to 73 years (M = 24.7, SD = 7.9). Results: The unifactorial structure of the PIL-SF with adequate adjustment was confirmed. In addition, the PIL-SF is invariant at the strong level based on gender and no differences are presented at the level of latent means. The internal consistency reliability is acceptable per group and the discrimination and item difficulty parameters are adequate. Conclusion: The PIL-SF is a valid, reliable, and accurate tool to measure the Purpose in Life construct in Ecuadorian adults.

Development and validation of the patient-reported outcome scale for chronic kidney disease

PurposeThe patient-reported outcomes (PROs) measuring patient’s experience and perception of disease are important components of approach to care. However, no tools are available to assess the PROs of chronic kidney disease (CKD). This study aims to develop and verify a PROs scale to evaluate clinical outcomes in CKD patients.MethodsThe theoretical structure model and original item pool were formed through a literature review, patient interviews and references to relevant scales. The Delphi method, classical test theory methods and item response theory method were used to select items and adjust dimensions to form the final scale. Altogether 360 CKD patients were recruited through convenience sampling. CKD-PROs could be evaluated from four aspects, namely reliability, content validity, construct validity, responsibility, and feasibility.ResultsThe CKD-PROs scale covers 4 domains, including the physiological, psychological, social, and therapeutic domain, and 12 dimensions, 54 items. The Cronbach’s α is 0.939, the split reliability coefficient is 0.945, and the correlation of the scores each item and domain’s coefficients range from 0.413 to 0.669. The results of structure validity, content validity and reactivity showed that the multidimensional measurement of the scale met professional expectations. The recovery rate and effective rate of the scale were over 99%.ConclusionThe CKD-PROs scale has great reliability, validity, reactivity, acceptability and is capable of being used as one of the evaluation tools for the clinical outcomes of CKD patients.

STUDENTS’ DEPTH OF COGNITIVE PERFORMANCE ON SECONDARY SCHOOL STATE MATHEMATICS TESTS

Latvia began curriculum reform implementation in 2020. Not only has the learning content changed, but students are also now able to choose from one of three levels to study mathematics in secondary school. This requires new exams at the end of each of these courses. The aim of this study is to investigate student performance and to what extent students can use higher cognitive skills on the new exams. Results were analyzed using Classical Test Theory and Item Response Theory. Comparing the results of the new exams using Wright maps shows a trend that, although there are flaws, they are more representative of the relevant population than the previous exam. A group of experts determined the level of cognition for each of the tasks and analyzed students' performance. The results show that there are tasks where students can demonstrate the highest level of cognitive abilities. However, such tasks are relatively few, and they are mathematical rather than problems in a real context. Performance analysis shows that students have difficulty expressing their thoughts and this is one of the reasons why only a small number of students solve challenging problems

Investigating the Dynamics in 18-36 Months Toddlers’ Vocabulary Acquisition

Objectives: The purpose of this study was to determine whether there were changes in language ability and vocabulary usage of children aged 18 to 36 months by specific time points. Methods: A total of 1,152 Korean children’s Wordbank data based on the MacArthur-Bates communication development assessment (K M-B CDI) were used for analysis. Korean Wordbank data is divided into two sections according to the time of data collection, one is collected before 2003, and the other is collected between 2016-2017. Data from the 2-time points were divided into time point 1 group (n = 988), and time point 2 group (n= 164). The total score and category score of K M-B CDI were compared between the time points. In addition, the significance of differences in each vocabulary item was compared by performing differential item functioning analysis based on classical test theory and item response theory. Results: This study found that the group difference in total score was not significant. However, the differences in category scores were found to be significant in 7 of the total 24 categories, and the scores of the time point 2 group were found to be significantly higher than the time point 1 group in the 6 categories. In addition, 117 items out of a total of 641 items were analyzed to have a differential function. Conclusion: Given that children in time point 2 showed higher performance in the categories of function words, it can be inferred that changes in children’s language skills may appear over time, and the results of this study also confirmed the dynamics of early children’s vocabulary use patterns.

Does Scoring Method Impact Estimation of Significant Individual Changes Assessed by Patient-Reported Outcome Measures? Comparing Classical Test Theory Versus Item Response Theory

ObjectivesThis study aimed to examine the ability of classical test theory (CTT) and item response theory (IRT) scores assessed by Patient-Reported Outcomes Measurement Information System® (PROMIS®) measures to identify significant individual changes in the setting of clinical studies, using both simulated and empirical data. MethodsWe used simulated data to compare the estimation of significant individual changes between CTT and IRT scores across different conditions and a clinical trial data set to verify the simulation results. We calculated reliable change indexes to estimate significant individual changes. ResultsFor small true change, IRT scores showed a slightly higher rate of classifying change groups than CTT scores and were comparable with CTT scores for a shorter test length. Additionally, IRT scores were found to have a prominent advantage in the classification rates of change groups for medium to high true change over CTT scores. Such an advantage became prominent in a longer test length. The empirical data analysis results using an anchor-based approach further supported the above findings that IRT scores can more accurately classify participants into change groups than CTT scores. ConclusionsGiven that IRT scores perform better, or at least comparably, in most conditions, we recommend using IRT scores to estimate significant individual changes and identify responders to treatment. This study provides evidence-based guidance in detecting individual changes based on CTT and IRT scores under various measurement conditions and leads to recommendations for identifying responders to treatment for participants in clinical trials.

Hyperhidrosis quality of life index (HidroQoL): further validation by applying classical test theory and item response theory using data from a phase III clinical trial

BackgroundThe Hyperhidrosis Quality of Life Index (HidroQoL ©) is a well-developed and validated patient-reported outcome measure assessing the quality-of-life impacts in hyperhidrosis with 18 items. Our aim was to extend the already existing validity evidence for the HidroQoL, especially in relation to structural validity. Especially Rasch analysis has not been applied to the final 18-item HidroQoL before.MethodsData from a phase III clinical trial were used. Confirmatory factor analysis was conducted to confirm the two a priori HidroQoL scales within classical test theory. Furthermore, the assumptions of the Rasch model (model fit, monotonicity, unidimensionality, local independence) and Differential Item Functioning (DIF) were assessed using item response theory.ResultsThe sample included 529 patients with severe primary axillary hyperhidrosis. The two-factor structure could be confirmed by the confirmatory factor analysis (SRMR = 0.058). The item characteristic curves showed mainly optimally functioning response categories, indicating monotonicity. The overall fit to the Rasch model was adequate and unidimensionality for the HidroQoL overall scale could be confirmed, since the first factor had an eigenvalue of 2.244 and accounted for 18.7%. Local independence was below assumed thresholds (residual correlations ≤ 0.26). DIF analysis, controlling for age or gender, was critical for four and three items, respectively. However, this DIF could be explained.ConclusionUsing classical test theory and item response theory/Rasch analyses, this study provided further evidence for the structural validity of the HidroQoL. This study confirmed several specific (measurement) properties of the HidroQoL questionnaire in patients with physician-confirmed severe primary axillary hyperhidrosis: the HidroQoL is a unidimensional scale allowing the summation of scores to generate a single score, and simultaneously it has a dual structure, also allowing the calculation of separate domain scores for daily activities and psychosocial impacts. With this study, we provided new evidence of the structural validity of the HidroQoL in the context of a clinical trial.Trial registration The study was registered (ClinicalTrials.gov identifier: NCT03658616, 05 September 2018, https://clinicaltrials.gov/ct2/show/NCT03658616?term=NCT03658616&draw=2&rank=1).

Development of a Visuoperceptual Measure for Fiberoptic Endoscopic Evaluation of Swallowing (V-FEES) in Adults with Oropharyngeal Dysphagia: An International Delphi Study.

Visuoperceptual evaluation of fiberoptic endoscopic evaluation of swallowing (FEES) is a commonly used assessment in dysphagia or swallowing disorders. Currently, no international consensus exists regarding which visuoperceptual measures to use for the analysis of FEES recordings. Moreover, existing visuoperceptual FEES measures are limited by poor and incomplete psychometric data, identifying an urgent need for developing a visuoperceptual measure to interpret FEES recordings. Following the COSMIN group's (COnsensus-based Standards for the selection of health Measurement INstruments) psychometric taxonomy and guidelines, this study aimed to establish the content validity of a new visuoperceptual FEES (V-FEES) measure in adults with oropharyngeal dysphagia. Using the Delphi technique, international consensus was achieved among dysphagia experts across 21 countries, resulting in a new prototype measure for V-FEES, comprising 30 items, 8 function testing items (i.e., specific tasks performed by patients while observing and rating items), and 36 unique operationalisations (i.e., defining items into measurable factors that could be measured empirically using visuoperceptual observation). This study supports good content validity for V-FEES, including participants' feedback on the relevance, comprehensiveness, and comprehensibility of the included items. Future studies will continue the instrument development process and determine the remaining psychometric properties using both the classic test theory (CTT) and item response theory (IRT) models.

Validation of the Bangla Communication Scale among Bangladeshi adolescents: A Classical Test Theory and Item Response Theory approach.

Assessing communication skills is necessary to facilitate pro-communication skills development programs. The 23-item Communication Scale (CS) is the most widely used tool for this purpose. Since there is a scarcity of validated tools to assess communication skills among Bangladeshi adolescents, we translated this questionnaire into Bangla and validated it on a Bangladeshi adolescent sample. We conducted two independent rounds of large-scale surveys that yielded data from 621 Bangladeshi adolescents (AgeMean±SD =16.44±1.32), of which 378 were males, and 244 were females. The participants completed the Bangla CS. A subset of the participants (n=160) also completed the Bangla Beck's Hopelessness Scale (BBHS)-a measure of hopelessness. Exploratory factor analysis on the first-round data (n=340) discarded six items and retained 17 items and revealed a unidimensional factor structure. Confirmatory Factor Analysis on the second-round data (n=281) supported the unidimensional structure (CFI=0.94, TLI=0.93). Measurement invariance analysis indicated that the unidimensional structure was robust across gender (143 males vs 139 females). The scale exhibited a negative correlation with BBHS revealing the scale's concurrent validity (r =-0.16, p <0.01). The scale exhibited satisfactory reliability (ωt = 0.79). The Item Response Theory-based analysis revealed that the scale was reliable (> 0.70) across a sizable range of communication skills continuum (θ = - 5.3 to 2.3) and had excellent marginal reliability (0.80). All items had adequate discriminating power (0.90 ± 0.20). The psychometric analysis of the 17-item Bangla-CS indicated that the scale is reliable and valid. We recommend that researchers and mental health practitioners utilize this scale to evaluate communication skills among Bangladeshi adolescents.

Validation and optimization of the French Generic Adherence for Chronic Diseases Profile (GACID-P) using classical test and item response theory

BackgroundThe Generic Adherence for Chronic Diseases Profile is a French generic scale (GACID-P) developed to measure adherence in several disease areas such as cardiology, rheumatology, diabetes, cancer and infectiology.MethodWe aimed to study the measurement invariance of the Generic Adherence for Chronic Diseases Profile by an item response model, optimize the new instrument version from item response model and qualitative content analyses results, and validate the instrument. The metric properties of the optimized version were studied according to classical test theory and item response model analysis.ResultsA sample of 397 patients consulting at two French hospitals (in diabetes, cardiology, rheumatology, cancerology and infectiology) and in four private practices was recruited; 314 (79%) patients also completed the questionnaire 15 days later. Factor analyses revealed four dimensions: “Forgetting to take medication”, “Intention to comply with treatment”, “Limitation of risk-related consumer habits” and “Healthy lifestyle”. The item response model and content analyses optimized these four dimensions, regrouping 32 items in four dimensions of 25 items, including one item conditioned on tobacco use. The psychometric properties and scale calibration were satisfactory. One score per dimension was calculated as the sum of the items for the dimensions “Forgetting to take medication” and “Intention to comply with treatment” and as a weighted score according to the item response model analysis for the two other dimensions because of differential item functioning found for two items.ConclusionFour adherence profile scores were obtained. The instrument validity was documented by a theoretical approach and content analysis. The Generic Adherence for Chronic Diseases Profile is now available for research targeting adherence in a broad perspective.

Impact of COVID-19 on quality of life in Peruvian older adults: construct validity, reliability and invariance of the COV19—Impact on Quality of Life (COV19-QoL) measurement

The aim of the present study was to translate into Spanish and evaluate the psychometric evidence of the Impact on Quality of Life (COV19-QoL) applied to a sample of Peruvian older adults (N = 298; 58.1% women, 41.9% men, mean age 65.34 years [SD = 11.33]). The study used techniques from the Classical Test Theory (CTT) and Item Response Theory (IRT). The findings confirmed the single factor structure of the COV19-QoL, high internal consistency reliability, measurement invariance by gender, and all items demonstrated adequate discrimination and difficulty indices. In this sense, the items allow adequate discrimination between low, medium and high levels of the impact of the COVID-19 pandemic on quality of life. In addition, a greater perceived impact of the pandemic on quality of life is necessary to answer the higher response options of the COV19-QoL. In conclusion, the COV19-QoL is a valid measurement scale of the impact of the COVID-19 pandemic on the quality of life of Peruvian older adults.