Test Of Theory Research Articles

Mitigating A-Site Segregation in Pyrochlore Oxides: Enhancing Oxygen Evolution Reaction Performance through Surface Engineering.

Significant progress has been achieved in enhancing the oxygen evolution reaction (OER) performance of pyrochloric oxides through geometric and electronic structure regulation. However, the issue of A-site cation segregation in these materials remains underexplored. In this study, Bi2Ru2O7, a promising OER electrocatalyst, is synthesized via a sol-gel method, and its surface is modified using l-ascorbic acid to address Bi3+ segregation. This treatment selectively removes the Bi2O3 passivation layer, inducing an amorphous RuOx layer that forms a heterostructure with crystalline Bi2Ru2O7. This engineered structure significantly enhances catalytic performance, reducing the overpotential to 259 mV at 10 mA cm-2 and maintaining stability after continuous operation for >30 h. Comprehensive characterization, electrochemical testing, and density functional theory calculations reveal that the improvements stem from an increased number of oxygen vacancies and enhanced electron transfer. This work underscores the importance of surface engineering to mitigate A-site segregation, providing a new strategy for optimizing Ru-based pyrochlores in energy conversion technologies.

Testing low energy string theory with strong gravitational lensing by black holes and constraints from EHT observations

Testing low energy string theory with strong gravitational lensing by black holes and constraints from EHT observations

Herth Hope Index in Ecuadorian university students: Psychometric analysis from classical test theory and item response theory

Herth Hope Index in Ecuadorian university students: Psychometric analysis from classical test theory and item response theory

Psychometric validation of the Danish BREAST-Q reconstruction module.

Patient-reported outcome measurement instruments are important tools in understanding a breast reconstruction's impact on the patients' quality of life. A psychometric validation is essential before applying a patient-reported outcome measurement instrument in clinical practice and research. The BREAST-Q is a specific, validated questionnaire for breast surgery outcomes that has been translated from English to Danish. It consists of 167 items in 7 pre-operative scales and 15 post-operative scales. This validation study aims to validate the Danish BREAST-Q reconstruction module. Eligible women were included from January 2019 to June 2020. Multiple-item scales with summated scores and more than 40 complete responses were eligible for psychometric validation, and psychometric analyses examined reliability and validity using Rasch Analyses and Classical Test Theory. Measurements included test for local response dependence, item fit, differential item functioning, and more. Clinical validity was assessed using known-groups hypotheses. We obtained 115 and 201 complete responses pre-and postoperatively, respectively. We validated 120 items in four preoperative and nine postoperative scales. The Rasch analyses disclosed evidence of local response dependence in eight scales. Chronbach's α ranged 0.81-0.95 after adjustment. Item fit was evaluated using item-restscore correlations and showed good fit in 98% of items. Differential Item Functioning was found in four items but had very little effect on the model. Clinical validity was supported by the know-group analyses. The Danish BREAST-Q reconstruction module has good acceptability, feasibility and validity, and adequate reliability. The results support the use in a Danish population.

Transient pulsed discharge preparation of graphene aerogel supports asymmetric Cu cluster catalysts promote CO2 electroreduction

Designing asymmetrical structures is an effective strategy to optimize metallic catalysts for electrochemical carbon dioxide reduction reactions. Herein, we demonstrate a transient pulsed discharge method for instantaneously constructing graphene-aerogel supports asymmetric copper nanocluster catalysts. This process induces the convergence of copper atoms decomposed by copper chloride onto graphene originating from the intense current pulse and high temperature. The catalysts exhibit asymmetrical atomic and electronic structures due to lattice distortion and oxygen doping of copper clusters. In carbon dioxide reduction reaction, the selectivity and activity for ethanol production are enhanced by the asymmetric structure and abundance of active sites on catalysts, achieving a Faradaic efficiency of 75.3% for ethanol and 90.5% for multicarbon products at −1.1 V vs. reversible hydrogen electrode. Moreover, the strong interactions between copper nanoclusters and graphene-aerogel support confer notable long-term stability. We elucidate the key reaction intermediates and mechanisms on Cu4O-Cu/C2O1 moieties through in situ testing and density functional theory calculations. This study provides an innovative approach to balancing activity and stability in asymmetric-structure catalysts for energy conversion.

Comparing two psychometric approaches: The case of item analysis for a classroom test in mathematics

Multiple-choice and constructed-response item formats are widely used in Philippine classrooms where tests are primarily summative. Conducting item analysis provides teachers the professional possibility to independently improve their test items while also allowing them to make informed decisions about test improvement and ensure that their assessments provide meaningful scores. Comparisons of item analysis approaches have been extensively used in standardized tests but not so much in small-scale testing such as classroom assessments. Hence, this research reports an empirical study where a summative test for classroom use is analyzed using psychometric techniques from the Classical Test Theory (CTT) and the Item Response Theory (IRT). This study employs an action research design where the primary author being a teaching practitioner-researcher, reports how an item analysis of his teacher-made summative test was conducted to improve the test items. Results from this study show that interpretations of the item parameter estimates from both psychometric approaches, CTT and IRT agree on most of the recommendations for the items. The items where the two approaches provide contrasting recommendations call for a further qualitative evaluation of the flagged items putting the teacher in a judicious position to discern which recommendations to follow regarding the concerned items. In the context of this study, an example of a guiding insight in deciding would be reflecting on the learning objectives measured by the test and the context in which the test was created.

МОДЕЛИРОВАНИЕ ПРОЦЕССОВ ОХЛАЖДЕНИЯ И ФОРМИРОВАНИЯ ТВЕРДОСТИ ЭКСТРУДАТА

The objective of the study is to reveal the patterns of cooling and hardening the extrudate in the technological line for obtaining textured flour. Objectives: to identify cause-and-effect relationships and determine the result and factor indicators of cooling and hardening of the extrudate; to develop theoretical and calculation schemes for determining the state of the system under study and to obtain a model representation of its result indicators. The methods of mathematical modeling, organization and planning of the experiment, the apparatus of descriptive statistics, correlation and regression analysis, the theory of random processes, Pearson, Student and Durbin-Watson statistical tests, as well as the methods of mathematical analysis implemented in the Statistics computer package of the Maple system were used. Theoretical and calculation schemes for determining the state of the studied system of "cooling and hardening of the extrudate" are proposed, and high-precision model representations are obtained for predicting the values of the result indicators and associated biophysical properties of the semi-finished product. Based on the analysis of existing and used in food systems extrusion technologies for processing plant raw materials into textured flour, the prospects for using the physical properties that determine the structure of the resulting wheat extrudate are determined. The theoretical problem of model representation of temperature and hardness of extrudate changing during cooling in a given technological time is substantiated. Such physical quantity as hardness of extrudate depending on humidity of initial raw material, temperature mode of processing and design features of cooler significantly influences content of protein, dietary fiber and other biotechnological characteristics of semi-finished product which can be used for prediction of transformation of food raw material into textured flour with high accuracy. The regularities of change in hardness and temperature of the extrudate during its cooling are investigated, and model representations are obtained for forecasting this technological process, which generalize the well-known empirical Newton's law to the objects of the system of "cooling and formation of hardness of the extrudate".

LAPS SA: Measuring Attachment to Dogs and Cats Among South American Countries.

Human biological and cultural evolution is tied to the relationships established with other animals. Attachment is one of the mechanisms established between dogs/cats and humans and allows the generation of affective bonds and close proximity. Many instruments have been used to study attachment of people to their dogs/cats, such as the Lexington Attachment to Pets Scale (LAPS). Our aim was adapting LAPS for South American populations (Brazil, Argentina, Chile, Uruguay, Peru and Colombia), and its languages (Brazilian Portuguese and South American Spanish) and evaluating them with South American data. We translated and back translated the instrument, examined versions with a pilot sample and collected data from 2832 respondents (18-85 y.o.), who lived with at least one cat/dog. We report and compare findings from psychometric analyses of the two versions of LAPS using both classical test (coefficient alpha, confirmatory factor analysis) and item response theory (Rasch analysis) methodologies. Findings demonstrate the comparability of the versions while observing some minor differences in their dimensionality. As in the original LAPS, results suggest one main dimension (general attachment) that assesses the general relationship between a person and a companion animal. We suggest that using appropriate language (e.g., companions and guardians instead of pets and owners) will improve understanding. We emphasize the importance of adapting wording and content of research tools considering cultural aspects of the populations studied. We introduce LAPS SA (LAPS South America) as a unified instrument to measure attachment between people and companion animals. Implications for the use of LAPS SA and future research are discussed.

The Competent Computational Thinking Test (cCTt): A Valid, Reliable and Gender-Fair Test for Longitudinal CT Studies in Grades 3–6

Abstract The introduction of computing education into curricula worldwide requires multi-year assessments to evaluate the long-term impact on learning. However, no single Computational Thinking (CT) assessment spans primary school, and no group of CT assessments provides a means of transitioning between instruments. This study therefore investigated whether the competent CT test (cCTt) could evaluate learning reliably from grades 3 to 6 (ages 7–11) using data from 2709 students. The psychometric analysis employed Classical Test Theory, Item Response Theory, Measurement Invariance analyses which include Differential Item Functioning, normalised z-scoring, and PISA’s methodology to establish proficiency levels. The findings indicate that the cCTt is valid, reliable and gender-fair for grades 3–6, although more complex items would be beneficial for grades 5–6. Grade-specific proficiency levels are provided to help tailor interventions, with a normalised scoring system to compare students across and between grades, and help establish transitions between instruments. To improve the utility of CT assessments among researchers, educators and practitioners, the findings emphasise the importance of (i) developing and validating gender-fair, grade-specific, instruments aligned with students’ cognitive maturation, and providing (ii) proficiency levels, and (iii) equivalency scales to transition between assessments. To conclude, the study provides insight into the design of longitudinal developmentally appropriate assessments and interventions.

The Multimorbidity Questionnaire (MMQ1): English translation and validation of a Danish patient reported outcome measure for quality of life in people with multiple long-term conditions in a cross-sectional survey.

MMQ1 is a Danish-language patient-reported outcome measure (PROM) for quality of life (QOL) in people with multiple long-term conditions (MLTC). It measures needs-based QOL across six scales: Physical ability, Concerns and worries, Limitations in daily life, Social life, Personal finances and Self-image. There is currently no such measure available in English. This study aimed to translate and validate MMQ1 for use in the United Kingdom. Translation used a two-panel method (expert panel: n = 5; and lay panel: n = 6). Content validity was assessed via cognitive interviews (n = 6). A postal survey of 2,753 patients with MLTC recruited through eight GP practices in Scotland included EQ-5D-5L and ICE-CAP as comparator measures alongside MMQ1. Classical test theory psychometric analysis of survey responses followed the International Society for Quality of Life Research minimum reporting standards. Translation resulted in an English-language MMQ1 with good face validity. Cognitive interviews established good content validity. 597 survey responses were received (response rate 22%). Good internal consistency reliability and concurrent validity were demonstrated. Confirmatory factor analysis showed acceptable fit to the six-scales of MMQ1. Five of the six scales also demonstrated good discriminative ability for detecting clinically meaningful differences in QOL. However, inter-item and inter-scale correlations suggested item redundancy and scale overlap. The English-language MMQ1 demonstrated adequate psychometric properties using classical test theory. Further validation using Rasch analysis is planned, and may help optimise and abbreviate the measure. This PROM has the potential to improve the measurement of QOL in MLTC research, including trials.

Psychometric properties of the 10-item Connor-Davidson Resilience Scale (CD-RISC-10) in adolescent and young adult psychiatric outpatients in the Texas Youth Depression and Suicide Research Network (TX-YDSRN).

This study assessed the psychometric properties of the 10-item Connor Davidson Resilience Scale (CD-RISC-10), a self-report measure of resilience, in youth receiving treatment and/or screening positive for depression/suicidality in psychiatric outpatient settings. Data from 908 youth (age 12-20 years) were analyzed. A confirmatory factor analysis (CFA) model was fit to the data, and goodness-of-fit was assessed using indices such as the comparative fit index (CFI). Psychometric analyses were performed through the lenses of classical test theory (CTT) and item response theory (IRT). Measurement invariance of the scale was assessed by classifying the sample by depression severity. Finally, intraclass correlation coefficients (ICC) from test-retest were used to assess the reliability of the scale using data collected at baseline and one-month post-baseline. The scale was unidimensional, representing a single latent trait. CFA demonstrated acceptable model fit (CFI = 0.94). CTT analyses showed good internal consistency (Cronbach's alpha 0.85) and good item discrimination (item-total correlations between 0.38 and 0.66). The scale demonstrated good test-retest reliability over a one-month period (ICC = 0.82). IRT analyses exhibited good item performance on all but the three items related to versatility, humor and persistence. These items were also deterrent to the scale having full scalar invariance. Limitations include questionable generalizability beyond the sample and biases inherent in self-report scales. CD-RISC-10 has acceptable reliability and validity. However, depressive symptom severity affected selected item performance. If these findings are confirmed in other independent samples, a seven-item version of the scale may be investigated for depressed samples.

Development and Validation of the Family and Community Nursing Advanced Practice Scale.

To develop and test a Family and Community Nursing-Advanced Practice Scale. A cross-sectional and methodological scale validation design, following classical test theory. Three phases, the first of which involved scale development, including item generation. Phase two assessed the content validity index. The third phase involved a cross-sectional survey to establish construct validity, content validity, internal consistency reliability, and exploratory factor analysis. The Family and Community Nursing Advanced Practice Scale has good construct validity, with the final scale consisting of 5 domains and 27 items. This was confirmed by both the exploratory and confirmatory factor analysis. The Cronbach's Alpha is very good, suggesting that the scale is reliable. When comparing family practice advanced practice nurses with those working in the community, the results show that scores are similar except for clinical reasoning and health promotion, which consistently showed statistically significant higher scores among the family practice nurses. While community nurses scored higher on items in the leading practice domain reflecting their role in a wider team of nurses. This study developed and psychometrically tested the Family and Community Nursing-Advanced Practice Scale. The scale has good reliability, and analysis of the construct validity reveals five domains of advanced practice among this practitioner group. The study suggests that advanced practice nurses working in community roles perform similar activities to those working in family practice in the United Kingdom. However, activity related to research was less evident. The study examined the scope of the advanced practice nurse role in family and community nursing. The study illustrated practice across five domains: clinical care, leading practice, clinical reasoning, health promotion, and ethics. The family practice and wider community roles were largely homogenous, with only two items showing a statistically significant difference in scores. STROBE guidelines for cross-sectional studies. No patient or public contribution.

Development of a short version of the perceived social support scale: based on classical test theory and ant colony optimization

BackgroundDespite the relatively small number of items on the Perceived Social Support Scale (PSSS-12), there has been a trend toward simplification of the scale in order to minimize testing time. In this situation, some researchers based on the responses of military spouses in the U.S., has simplified the PSSS-12 to develop the PSSS-M6. This study aimed to develop a short version of the PSSS-12 suitable for the Chinese general population.MethodsA multi-stage stratified cluster sampling method was employed to collect data from 10,914 residents in 120 cities across the country. After randomly dividing the data into two parts, exploratory analysis and confirmatory analysis were conducted separately. During the exploratory analysis of dataset 1, the scale was simplified using both Classical Test Theory (CTT) and the Ant Colony Optimization (ACO), resulting in one short form for each approach. Additionally, three short forms were obtained by introducing other short forms of the Multidimensional Scale of Perceived Social Support (MSPSS) scale derived from multidimensional item response theory in previous studies. The reliability and discriminant validity of the three short forms were tested. Subsequently, the reliability, validity, model fit and measurement invariance for the two short forms of the MSPSS scale were examined using dataset 2.ResultsThe 6-item short form developed based on the ACO (PSSS-A6) exhibited the best psychometric properties among all the short forms. Moreover, the 3-item short form composed of items with the highest factor loadings in each dimension also demonstrated good psychometric properties.ConclusionsIn future research, if a short form of the MSPSS scale is needed for measurement purposes, the 3-item short form is suitable for clinical settings, large-scale cross-sectional studies, or longitudinal studies, while the PSSS-A6 is more appropriate for more precise measurements.Trial registrationThis study underwent ethical review (JNUKY-2021-018) by Jinan University.

대학 인문사회계열 신입생의 고등학교 수학과 학업성취에 관한 연구: S대학교를 중심으로

Objectives The purpose of this study is to analyze the understanding of the high school mathematics contents of freshmen majoring in the humanities and social sciences. Methods To this end, a test consisting of 19 questions was administered to assess the mathematics academic achievement of freshmen at S University, aligned with the achievement standards of the high school mathematics curriculum. To examine the mathematical academic achievement of humanities and social sciences freshmen from high school, the difficulty levels based on classical test theory were used. Academic achievement according to the type of the high school and subject was analyzed using Kruskal-Wallis test and Mann-Whitney test. Results The results of this study are as follows. First, the academic achievement in high school mathematics among freshmen in the humanities and social sciences is low. The average correct answer rate for the 19 questions was only 39.35%, and 13 questions were analyzed as being more difficult than the standards presented in the curriculum evaluation criteria. Second, freshmen who graduated from general high schools showed higher academic achievement than those who graduated from specialized high schools and overseas high schools. Third, academic achievement in mathematics was higher than in Mathematics I and Mathematics II. Conclusions Universities need to analyze the mathematical content knowledge required for humanities and social sciences students to learn their major subjects and provide customized teaching and learning programs to help students understand that knowledge. Additionally, it is necessary to continuously measure the high school mathematics academic achievement of new university students in consideration of changes in the curriculum and to establish a system for feedback.

Psychometric properties of the Swedish version of the Patient Health Questionnaire-9: an investigation using Rasch analysis and confirmatory factor analysis

Depression is one of the most common psychiatric conditions. Given its high prevalence and disease burden, accurate diagnostic procedures and valid instruments are warranted to identify those in need of treatment. The Patient Health Questionnaire-9 (PHQ-9) is one of the most widely used self-report measures of depression, and its validity and reliability has been evaluated in several languages. However, the Swedish translation has yet not been subject to psychometric evaluation, and no previous psychometric evaluation of the instrument have used both Rasch analysis and classic test theory. The aim of this study was to investigate validity and reliability of the PHQ-9 in a Swedish sample of individuals with self-reported current or past mental health problems using Rasch analysis and confirmatory factor analysis. A sample of 4958 participants was recruited from an online survey covering different aspects of covid-19 and mental health targeted towards individuals with mental health problems. Results showed that a one-factor solution fit the data after removing one item and that some items had a different response pattern for older respondents. Furthermore, after removing item 2 and merging the two middle response categories for item 9, the Swedish translation of PHQ-9 showed adequate psychometric properties. The findings suggests that the Swedish translation of PHQ-9 may need to be adapted in order to make adequate interpretations of an individual score and to differentiate between populations. Further tests of its validity and reliability in other Swedish samples are needed to fully understand the properties of the Swedish version of PHQ-9.

The Riddle Knowledge Inference Test (R-Kit)

Inference is considered an important factor in comprehension models and has been described as a causal factor in predicting comprehension. To date, specific tests for inference are rare and often rely on specific thematic texts. This reliance on thematic inference may raise some concerns as inference is related to prior text-specific knowledge. The Riddle Knowledge Inference Test consists of 14 riddles written in French with different specific topics for each item and was administered to 565 participants in a longitudinal study from grade 2 to grade 5. Both classical test theory and item response theory provide evidence of reliability, with a one-factor solution of [Formula: see text] = .860 and metric invariance for gender and social background. However, due to the large differences in the level of latent scores between participants, it was not possible to establish a standard setting for each grade.

An item response theory analysis of the Dissociative Experiences Scale II: examining psychometric properties and longitudinal stability among Japanese adults

BackgroundThe Dissociative Experiences Scale (DES-II) is widely used globally. However, psychometric properties of the scale have not been adequately examined. The present study aimed to examine the psychometric properties and longitudinal stability of the DES-II.MethodWe collected data at two time points, approximately three and a half years apart. At Time 1 (T1), 1029 participants (515 females, 514 males) with a mean age of 44.64 (± 14.02) responded to the survey. Out of the T1 participants, 210 individuals (105 females, 105 males) also responded to the T2 survey. We conducted item parameters of the DES-II with item response theory (IRT).ResultsOur results showed that the DES-II is suitable for measuring strong dissociative traits, with all items displaying high discriminative power. The cut-off points for the DES-II were within a good range of measurement accuracy, and longitudinal stability over approximately three and a half years was adequate.ConclusionIn the present study, we applied item response theory (IRT) to the DES-II, which has traditionally been interpreted using classical test theory (CTT). Results suggested the need for item-focused assessment rather than relying solely on mean scores or cut-off points. Specifically, results suggested that the severity levels differed across item ratings, and to set cut-off points for each item based on the severity of the ratings. Furthermore, the possibility of cultural differences in response patterns of the DES-II was indicated. However, few studies have discussed cultural differences based on IRT; hence, further research should examine response patterns of the DES-II across various cultures. In conclusion, the DES-II is a valuable tool for assessing dissociative symptoms, with adequate psychometric properties from an item response theory perspective. Clinicians should consider item-specific responses in their assessments, and further research is needed to explore the scale's applicability across diverse populations.

Patient‐Reported Outcome Scale for Allergic Rhinitis (AR‐PRO): Development and Validation in China

ABSTRACTBackgroundPatient‐reported outcomes (PROs) have become indispensable measures in allergic rhinitis (AR) clinical trials. However, there is currently no scale specifically designed for the Chinese population. This study aimed to develop and validate the patient‐reported outcome scale for allergic rhinitis (AR‐PRO) to provide a reliable tool for AR patients in China.MethodsWe analyzed the relevant literature and medical records, and conducted interviews and panel discussions to develop the conceptual framework and generate the item pool. We subjected the collected items to removal, mergence, or modification to form the initial scale through a qualitative review by experts and patients. Subsequently, we conducted two field surveys to select items for the final scale based on the classical test theory and item response theory (IRT). Finally, we conducted a formal survey to assess the measurement properties of the AR‐PRO.ResultsThe AR‐PRO comprised 20 items across four domains, including physiology, psychology, environment, and satisfaction. The Cronbach's α coefficient and intraclass correlation coefficient (ICC) between two AR‐PRO‐based measurements were 0.910 and 0.950, respectively. The content validity, structural validity, criterion validity, and discriminant validity all met relevant standards. The item analysis results based on IRT were acceptable. Both the response rate and completion rate of the scale were 100%, and the average completion time was 380.4 ± 123.6 s.ConclusionThe 20‐item AR‐PRO developed may be a reliable and scientific measure for AR clinical trials as it exhibited good reliability, validity, and feasibility.

Quantitative Research in Education: Philosophy, Uses and Limitations

Conventionally, the quantitative research approach is believed to be used in natural science to experiment with phenomena and test theories and hypothesis. However, it has been practiced by researchers in social science and education at present. The study aims to critically analyze the philosophical stances of quantitative research and to explore the uses and limitations of quantitative research methods in education. I used document analysis as a research method where I collected previously published books, journal articles, and book chapters in the related field, read them, explored the required information from the materials, analyzed them critically, and made the arguments in different themes. The study revealed that quantitative research is based on the positivist paradigm which believes in objectivity, and experimental reality. It further showed that quantitative research is significant in the field of education to test the methods, and teaching-learning theories, to see the cause-and-effect relationship, and to see the causal relationship between the variables. Moreover, it shows that quantitative research is significant to explore the results that can be generalized in a large population. Additionally, the study explored that quantitative research has several issues such as negligence on educational complexities, sampling bias, issues of validity, and generalizability, and ethical issues related to consent, confidentiality, anonymity, sampling, data collection, interpretation, and reporting. It suggests that researchers in education should incorporate the qualitative method and mixed-method research to address diversity, emotion, experience, and multiple realities.

Rasch Analysis of the Dermatology Life Quality Index

Previous results of the Dermatology-Life-Quality-Index (DLQI) validation in Colombia based on the classical test theory (CTT) perspective have showed the need to delve into its measurement properties. Therefore, we aimed to assess the structural validity, internal consistency and item response analysis of the DLQI through the item response theory (IRT) or the Rasch model. We assessed the dimensionality of the DLQI, determined its difficulty, discrimination and differential functioning and went on to evaluate its internal consistency and discriminative validity among patients with inflammatory and non-inflammatory skin disease. We recruited Colombian patients with different skin diseases. Data of 865 patients (mean age, 49.3 years; 61% females) were included. DLQI-scores ranged from 0 up to 30. Internal consistency for dichotomous item #7 showed a McDonald's Omega coefficient of 0.85 (95%CI, 0.84-0.87) and a Cronbach's α coefficient of 0.86 (95%CI, 0.84-0.88). For ordinal item #7, the McDonald's Omega coefficient was 0.87 (95%IC:0.85-0.89) and Cronbach's α coefficient, 0.84 (95%CI, 0.82-0.87). Horn's parallel analysis revealed the presence of DLQI unidimensionality with a 1-factor solution. Only item #1 fitted the PCM model. The remaining items, including item #9, did not show adequate fit due to overlapping responses and order changes. The validity of DLQI-COL based on Rasch analysis proved not to be a suitable instrument to evaluate QoL in our dermatologic population. A refined version of the scale with an adequate cross-cultural adaptation and validation process is needed to obtain an appropriate and reliable version of the instrument for QOL measuring in Colombian patients with skin diseases.