Excellent Psychometric Properties Research Articles

Instrumental activities of daily living in neuro-oncology: International validation of the EORTC IADL-BN32 questionnaire

BackgroundNeurocognitive impairments are common in patients with a brain tumour, and may negatively impact on functioning in daily life, particularly on instrumental activities of daily living (IADL). The EORTC IADL-BN32 questionnaire was developed to measure IADL in this patient population. MethodsIn this international validation study, we evaluated the EORTC IADL-BN32 questionnaire on several psychometric properties in a large sample of patients with a primary or metastatic brain tumour. We administered the 32-item questionnaire three times: at ‘baseline’, after 2 weeks and after 3 months. Procedures were in accordance with EORTC Quality of Life Group module development guidelines. ResultsIn total, 326 patients participated in the study. A bifactor scale structure showed satisfactory model fit measures, with five multi-item scales and two single items, and an IADL sum score. The internal consistency of the multi-item scales ranged from good to excellent (range Cronbach’s α: 0.86–0.97). We found significant differences in scale scores between patients with and without neurocognitive impairments or complaints, supporting the construct validity. Initial cross-cultural validity analyses showed indications of item response biases for certain items. Analyses indicated moderate to good test-retest agreement (intraclass correlation coefficient > 0.70) between baseline and the 2-week follow-up assessment for all but one scale. Deterioration of EORTC IADL-BN32 scale scores were consistent with clinically relevant deterioration on other functional measures with small to large effect sizes, however, subgroup sample sizes were small. ConclusionOverall, the EORTC IADL-BN32 questionnaire exhibited adequate to excellent psychometric properties. Cross-cultural validity and responsiveness should be further explored.

Cross-cultural validation of the BFOE model: Best practices and future directions for psychometric evaluation of the Fear of positive evaluation scale – Insights from a Dutch translation

The Bivalent Fear of Evaluation (BFOE) model suggests that Social Anxiety Disorder is not only characterized by fear of negative evaluation (FNE), but also fear of positive evaluation (FPE). While FNE has been firmly established, research of the latter is accumulating. To evaluate the role of the BFOE Model, and particularly FPE, validated measures such as the Fear of Positive Evaluation Scale (FPES) are pivotal. Yet, validation of psychometric properties is often at stake or neglected when translating a scale to other languages. This hampers cross-cultural evaluation of questionnaires and related concepts considerably, including the BFOE Model. To illustrate, a freely available, but not validated Dutch version of the FPES was completed, along with other measures by 354 community participants from the Netherlands and Belgium in an online study. The Dutch FPES showed excellent convergent and discriminant validity. In addition, it explained additional variance in social anxiety above and beyond FNE. These results as well as those from the factor analyses were highly comparable with those deriving from evaluations of the original English version. In conclusion, the Dutch FPES showed excellent psychometric properties and is fit for further exploring consistency or differences in the BFOE model across cultures. Based on this case, practice guidelines for international use and validation of measures are discussed, and recommendations are provided.

Linguistic and cultural validation of symptom questionnaire for visual dysfunctions (SQVD) for psychometric analysis in the Chinese context.

The Spanish scale symptom questionnaire for visual dysfunctions (SQVD) was sinicized and tested for reliability and validity in the Chinese context, employing both classical measurement theory and item response theory. A meticulous translation was conducted using the modified Brislin translation model, with input from experts for cross-cultural debugging and in-depth review. Following a pre-survey study, the Chinese version of the SQVD was finalized. A convenience sampling method was used to select 270 patients from the target group and 252 valid questionnaires were successfully collected. The Rasch model was employed to assess response category functionality, fit statistics, unidimensionality, person and item reliability, separation, targeting, and differential item functioning. Classical test theory was applied to evaluate internal consistency and retest reliability, supplemented by correlation analysis. Job characteristic curves were also plotted to assess diagnostic accuracy. The Chinese SQVD conformed to a unidimensional structure with excellent reliability and validity. Person and item reliabilities were 0.85 and 0.99, respectively, indicating, high stability. Person and item separation indices were 2.37 and 11.54, respectively, signifying strong differentiation ability. Retest reliability was 0.917, further emphasizing the stability of the scale. The area under the receiver operating characteristic curve was 0.908 (95% CI: 0.854, 0.962), with a cutoff value of 7.5 and Youden index of 0.733, highlighting the scale's high diagnostic accuracy. The translated and culturally adapted Chinese SQVD demonstrated excellent psychometric properties. With streamlined items, short assessment time, and high efficiency, the scale is a stable and reliable clinical tool for detecting a variety of conditions related to refractive, regulatory, and binocular vision dysfunction.

Questionnaire for the Assessment of Coparenting (CECOP): Development and Validation

AbstractTaking coparenting into consideration is essential when assessing children and their relational environment, regardless of the family structure. This paper presents three studies we conducted with the aim of developing and validating a reliable instrument for the assessment of coparenting in Spanish. The first study consisted of developing the items to be included in the assessment tool and evaluation of this content by a panel of nine experts. In the second study, we explored both the psychometric properties and the factorial structure of the prototype instrument using a sample of 251 participants. The third study confirmed the factorial structure and tested measurement invariance, the reliability, and convergent and discriminant evidence of our tool in a general population sample of 312 participants. We obtained a 15-item unidimensional questionnaire, the Questionnaire for the Assessment of Coparenting (CECOP), with very good psychometric properties: excellent internal consistency with α of 0.97 and supported validity with the selected conceptually related metrics; convergent validity with the Instrument for the Assessment of Adaptation to Divorce–Separation’s (CADS) coparenting dimension and Questionnaire on Perceived Support from the Former Partner (CARE); and divergent validity with parenting and dyadic adjustment. Furthermore, the results in terms of measurement invariance across family structures and sex allowed us to assume the configural invariance between the groups. However, it was not possible to assume metric invariance. Finally, we also provide normative scores for its interpretation. The CECOP shows excellent psychometric properties and can be considered the first questionnaire in Spanish that assesses coparenting in any family structure, which also includes the triadic conceptualization of coparenting, providing valuable information on the relational environment in which children and adolescence live.

Coercion in psychiatry: psychometric validation of the Portuguese Staff Attitudes to Coercion Scale (SACS)

BackgroundThere is a growing recognition that staff attitudes toward coercion in mental health care may influence its application. This study presents the psychometric properties of the Portuguese version of the Staff Attitudes towards Coercion Scale (SACS) and describes mental health professionals’ attitudes towards coercion in Portugal.MethodsMental health professionals working in five Portuguese mental health services in urban and rural regions of Portugal were invited to complete a questionnaire comprising the SACS and a socio-demographic form. Psychometric analyses including construct validity and internal consistency were carried out using R software.ResultsA total of 91 out of 119 questionnaires completed were valid for analysis. Fifty-seven (62.64%) respondents were female, with an age range of 24 to 69 years (M = 39.33; SD = 11.09). More than half of them were nurses (52.75%, n = 48), and a third were psychiatrists (36.26%, n = 33). A three-factor structure was confirmed and showed the best fit compared to previously proposed models with a cumulative explained variance of 59%. The Portuguese SACS exhibited adequate internal consistency for both the full-scale and subscales. The highest mean score was in the pragmatic attitude domain (20.60; SD = 3.37). A negative correlation was observed between the critical attitude domain and both age and years of experience (p < 0.05).ConclusionA three-factor structure was confirmed and showed the best fit compared to previously proposed models. The Portuguese SACS showed excellent psychometric properties and is acceptable for assessing staff attitudes towards coercion.

Distinguishing genuine from simulated dissociative identity disorder using the Morel Emotional Numbing Test.

Few studies have identified validity tests that are appropriate for use in individuals with dissociative identity disorder (DID). This study investigated whether the Morel Emotional Numbing Test (MENT) could distinguish between genuine and simulated DID. Thirty-five participants with DID diagnosed via a semistructured interview were compared to 88 participants taking an abnormal psychology course who were instructed to simulate DID. Group comparison analyses were conducted to examine differences in the MENT errors. Univariate logistic regression and receiver operating characteristic curve analyses examined how well the MENT errors discriminated between groups and identified a cutoff optimizing sensitivity while maintaining high specificity. Simulators had significantly more errors across all three MENT sets compared to genuine DID participants. The total number of MENT errors across sets most strongly and significantly predicted genuine versus simulated DID groups. Receiver operating characteristic curve analyses indicated that the MENT could discriminate between genuine and simulated DID with outstanding classification accuracy (area under the curve = .95). A cutoff of ≥ 10 total errors on the MENT yielded an optimal balance of sensitivity (.86) and specificity (.94). However, the previously defined cutoff of ≥ 8 total errors also demonstrated high sensitivity (.87) and specificity (.89). Findings provide preliminary evidence for the MENT as a validity test for DID populations. Although the commonly used cutoff of ≥ 8 errors on the MENT demonstrated excellent psychometric properties, we recommend using a cutoff of ≥ 10 errors for individuals with DID to minimize the risk of false positives while maintaining strong sensitivity. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Introduction and validation of the open symptom framework: a public domain modular framework for patient-reported measurement of symptoms related to cancer and its treatment

PurposeWe provide an initial description and validation of some public domain patient-reported outcome (PRO) items to assess cancer symptom burden to address immediate barriers to symptom assessment use in clinical practice and facilitate future research.MethodsWe created the Open Symptom Framework (OSF), a flexible tool for clinical cancer-related symptom assessment. The items comprise six components: recall period, concept, symptom, qualifier(s), a definition, and a 5-point Likert-type response. We recruited patients receiving cancer therapy in the United States and United Kingdom. We assessed external construct validity by comparing OSF scores to the PRO-CTCAE measure and assessed reliability, scalability, dimensionality, and item ordering within a non-parametric item response theory framework. We tested differential item functioning for country, age, gender, and level of education.ResultsWe developed a framework alongside clinical and psychometric experts and debrieifed with 10 patients. For validation, we recruited 331patients. All items correlated with the PRO-CTCAE equivalents (r = 0.55–0.96, all p < 0.01). Mokken analysis confirmed the scalability and unidimensionality of all symptom scales with multiple items at the scale (Ho = 0.61–0.75) and item level (Hi = 0.60–0.76). Items are interpreted consistently between demographic groups (Crit = 0 for all groups).ConclusionThe public domain OSF has excellent psychometric properties including face, content, and criterion validity and can facilitate the development of flexible, robust measurements to fulfil stakeholder need. The OSF was designed specifically to support clinical assessment but will function well for research. Further work is planned to increase the number of symptoms and number of questions per symptom within the framework.

Systematic review and tools appraisal of prognostic factors of return to work in workers on sick leave due to musculoskeletal and common mental disorders.

With the overall objective of providing implication for clinical and research practices regarding the identification and measurement of modifiable predicting factors for return to work (RTW) in people with musculoskeletal disorders (MSDs) and common mental disorders (CMDs), this study 1) systematically examined and synthetized the research evidence available in the literature on the topic, and 2) critically evaluated the tools used to measure each identified factor. A systematic search of prognostic studies was conducted, considering four groups of keywords: 1) population (i.e., MSDs or CMDs), 2) study design (prospective), 3) modifiable factors, 4) outcomes of interest (i.e., RTW). Studies showing high risk of bias were eliminated. Tools used to measure prognostic factors were assessed using psychometric and usability criteria. From the 78 studies that met inclusion criteria, 19 (for MSDs) and 5 (for CMDs) factors reaching moderate or strong evidence were extracted. These factors included work accommodations, RTW expectations, job demands (physical), job demands (psychological), job strain, work ability, RTW self-efficacy, expectations of recovery, locus of control, referred pain (back pain), activities as assessed with disability questionnaires, pain catastrophizing, coping strategies, fears, illness behaviours, mental vitality, a positive health change, sleep quality, and participation. Measurement tools ranged from single-item tools to multi-item standardized questionnaires or subscales. The former generally showed low psychometric properties but excellent usability, whereas the later showed good to excellent psychometric properties and variable usability. The rigorous approach to the selection of eligible studies allowed the identification of a relatively small set of prognostic factors, but with a higher level of certainty. For each factor, the present tool assessment allows an informed choice to balance psychometric and usability criteria.

VISCERAL SENSITIVITY INDEX (VSI-IT): Italian Adaptation and Validation.

The Visceral Sensitivity Index (VSI) represents a significant advancement in the assessment of gastrointestinal-specific anxiety among patients with irritable bowel syndrome (IBS) and chronic inflammatory bowel diseases (IBD)-such as ulcerative colitis and Crohn's disease. However, an Italian version of the instrument is not yet available for the Italian-speaking population. This study utilized a national sample of 500 individuals divided into four groups: (a) patients with Crohn's disease, (b) patients with ulcerative colitis, (c) patients with IBS, and (d) healthy controls (individuals without any diagnoses) to test the validity and reliability of the Italian VSI. Using back-translation methodology to ensure translation fidelity, this research applied a questionnaire and the VSI through an online format to 500 participants. Confirmatory Factor Analysis (CFA) revealed that the Italian VSI had excellent psychometric properties, demonstrating high internal consistency (Cronbach's α = 0.949) and construct validity. The scale proved sensitive in detecting significant differences in visceral sensitivity among groups, highlighting its utility as a clinical and research assessment tool. Specifically, the Italian VSI exhibited a unidimensional factorial structure and maintained a strong correlation with interoceptive awareness, type of disease, and gastrointestinal symptom severity, confirming its role in enhancing the understanding and management of IBD and IBS in Italy.

LanguageScreen: The Development, Validation, and Standardization of an Automated Language Assessment App.

Oral language skills provide a critical foundation for formal education and especially for the development of children's literacy (reading and spelling) skills. It is therefore important for teachers to be able to assess children's language skills, especially if they are concerned about their learning. We report the development and standardization of a mobile app-LanguageScreen-that can be used by education professionals to assess children's language ability. The standardization sample included data from approximately 350,000 children aged 3;06 (years;months) to 8;11 who were screened for receptive and expressive language skills using LanguageScreen. Rasch scaling was used to select items of appropriate difficulty on a single unidimensional scale. LanguageScreen has excellent psychometric properties, including high reliability, good fit to the Rasch model, and minimal differential item functioning across key student groups. Girls outperformed boys, and children with English as an additional language scored less well compared to monolingual English speakers. LanguageScreen provides an easy-to-use, reliable, child-friendly means of identifying children with language difficulties. Its use in schools may serve to raise teachers' awareness of variations in language skills and their importance for educational practice.

Translation, cross-cultural adaptation, and psychometric evaluation of the brief illness perception questionnaire into Yoruba language among persons with chronic low back pain

BackgroundIllness perception may influence the coping behaviors of patients. There is a lack of tools to measure this construct among Yoruba speakers. Therefore, we translate, cross-culturally adapt and determine the reliability and the validity of the Yoruba version of the Brief Illness Perception Questionnaire (BIPQ-Y).MethodsThe translation and cross-cultural adaptation process was according to Beaton criteria. The psychometric testing of the BIPQ-Y was carried out among 28 consenting patients with low back pain attending a university teaching hospital, while only 10 of them participated in the reliability test. The convergent and discriminant validity of the BIPQ-Y was carried out using the Fear Avoidance Belief Questionnaire and Quadruple Visual Analogue scale. Confirmatory factor analysis was to assess construct validity.ResultsThe mean age of the respondents was 47 ± 15.3 years. The concurrent validity of the BIPQ-Y was excellent (r = 0.996) for the total score of BIPQ-Y while the internal consistency was moderate (α = 0.52). The test–retest of BIPQ-Y yielded excellent results with item intra-class correlation coefficient (ICC) ranging between 0.833 and 0.973 and an overall ICC of 0.889. For the confirmatory analysis of the BIPQ-Y, the factor loading for the eight items ranged from − 0.071 to 0.799 and the composite reliability was good with a score of 0.68.ConclusionThe BIPQ-Y demonstrated excellent psychometric properties that are satisfactory with standards, and it is recommended for assessing illness perceptions of patients with chronic low back pain among the Yoruba-speaking populations.

Why Do People Watch Pornography? Cross-Cultural Validation of the Pornography Use Motivations Scale (PUMS) and Its Short Form (PUMS-8)

ABSTRACT Motivations for pornography use may vary across gender identities, sexual orientations, and geographical regions, warranting examination to promote individual and public health. The aims of this study were to validate the Pornography Use Motivations Scale (PUMS) in a diverse, multicultural sample, and develop a short form (PUMS-8) that can assess a wide range of pornography use motivations. Using data from 42 countries (N = 75,117; Mage = 32.07; SDage = 12.37), enabled us to thoroughly evaluate the dimensionality, validity, and reliability of the Pornography Use Motivations Scale (PUMS), leading to the development of the more concise PUMS-8 short scale. Additionally, language-, nationality-, gender-, and sexual-orientation-based measurement invariance tests were conducted to test the comparability across groups. Both the PUMS and the PUMS-8 assess eight pornography use motivations, and both demonstrated excellent psychometric properties. Sexual Pleasure emerged as the most frequent motivation for pornography use across countries, genders, and sexual orientations, while differences were observed concerning other motivations (e.g. self-exploration was more prevalent among gender-diverse individuals than men or women). The motivational background of pornography use showed high similarity in the examined countries. Both the PUMS and the PUMS-8 are reliable and valid measurement tools to assess different types of motivations for pornography use across countries, genders, and sexual orientations. Both scales are recommended for use in research and clinical settings.

Paradox of Self-Stigma: Psychometric Validation for the Portuguese Population in Poverty

Stigma is the attribution of labels to individuals to diminish or weaken them in society. The internalized stigma affects self-stigma, which influences their self-concept and confidence. The aim of this study was to translate and validate the PaSS-24 (Paradox of Self-Stigma Scale) for the population living in poverty in Portugal. The scale was translated using the back-translation technique, and the questionnaire was answered online by 357 people living in poverty in Portugal. The results of the exploratory factor analysis show excellent factorial validity, maintaining the factors of the original scale, and the results of the internal consistency, convergent and discriminant validity show excellent psychometric properties.

Development and Validation of a Bedside Scale for Assessing Upper Limb Function Following Stroke: A Methodological Study.

Background Numerous tools are available for evaluation of upper limb (UL) functions among stroke survivors. Despite the excellent psychometric properties, many require considerable amount of time, are resource-intensive, and often impractical for bedside evaluation. Objectives To develop and concurrently validate a simple, resource-efficient, and time-efficient bedside tool for evaluating UL function in stroke survivors. Methods Relevant literature review was carried out to conceptualize and define the theoretical framework of day-to-day UL movement tasks. Subsequently, an item pool of 18 UL movements was developed. A mini-Delphi method was employed to verify content validity. During the iterative rounds, 18-items were revised and refined to a 12-items scale. The final bedside upper limb evaluation tool (BUFET) scale underwent concurrent validation by correlating the scores with Wolf Motor Function Test (WMFT) scores using Spearman’s correlation coefficient. Internal consistency was evaluated through Cronbach’s alpha. Results Concurrent validity and internal consistency of the scale were supported by a high correlation coefficient (r = 0.937; p&lt;0.001) with WMFT and high Cronbach’s alpha (0.948). Conclusions Newly developed BUFET was found to be a valid and reliable bedside tool in the evaluation of upper limb functions and can be administered in a resource and time-efficient manner.

Impulsivity is a stable, measurable, and predictive psychological trait

Impulsivity is a personality construct frequently employed to explain and predict important human behaviors. Major inconsistencies in its definition and measurement, however, have led some researchers to call for an outright rejection of impulsivity as a psychological construct. We address this highly unsatisfactory state with a large-scale, preregistered study (N = 1,676) in which each participant completed 48 measures of impulsivity derived from 10 self-report scales and 10 behavioral tasks and reported frequencies of seven impulsivity-related behaviors (e.g., impulsive buying and social media usage); a subsample (N = 196) then completed a retest session 3 mo later. We found that correlations between self-report measures were substantially higher than those between behavioral tasks and between self-report measures and behavioral tasks. Bifactor analysis of these measures exacted one general factor of impulsivity I, akin to the general intelligence factor g, and six specific factors. Factor I was related mainly to self-report measures, had high test-retest reliability, and could predict impulsivity-related behaviors better than existing measures. We further developed a scale named the adjustable impulsivity scale (AIMS) to measure I. AIMS possesses excellent psychometric properties that are largely retained in shorter versions and could predict impulsivity-related behaviors equally well as I. These findings collectively support impulsivity as a stable, measurable, and predictive trait, indicating that it may be too early to reject it as a valid and useful psychological construct. The bifactorial structure of impulsivity and AIMS, meanwhile, significantly advance the conceptualization and measurement of construct impulsivity.

Translation, Cultural Adaptation, and Validation into Romanian of the Myeloproliferative Neoplasm Symptom Assessment Form-Total Symptom Score (MPN-SAF TSS or MPN-10) Questionnaire.

Background: Patients with myeloproliferative neoplasms (MPNs) experience a high disease-related symptom burden. A specific instrument to evaluate quality of life (QoL), i.e., the MPN Symptom Assessment Form Total Symptom Score (MPN-SAF TSS; MPN-10), was developed. We conducted the translation, cultural adaptation, and validation into Romanian of the MPN-10. Methods: We translated the MPN-10 and tested its psychometric properties. Results: We recruited 180 MPN patients: 66 polycythemia vera (36.67%), 61 essential thrombocythemia (33.89%), 51 primary and secondary myelofibrosis (SMF) (28.33%), and 2 MPN-unclassifiable (1.11%). The mean TSS was 19.51 ± 16.51 points. Fatigue, inactivity, and concentration problems were the most cumbersome symptoms. We detected scoring differences between MPN subtypes regarding weight loss (p < 0.001), fatigue (p = 0.006), early satiety (p = 0.007), night sweats (p = 0.047), pruritus (p = 0.05), and TSS (p = 0.021). There were strong positive associations between TSS and inactivity, fatigue, and concentration problems, and moderate negative correlations between QoL scores and all MPN-10 items. Cronbach's α internal consistency coefficient was 0.855. The Kaiser-Meyer-Olkin construct validity test result was 0.870 and the Bartlett Sphericity Test was significant (p < 0.001). Symptom scores were loaded into one single factor according to the exploratory factor analysis. Conclusions: The Romanian MPN-10 version displayed excellent psychometric properties and is a reliable instrument for assessing symptom burden and QoL in Romanian MPN patients.

Validity and reliability of the Italian version of the short Parkinson's evaluation scale (SPES/SCOPA)

BackgroundIn the medical and rehabilitative field, it is essential to employ tools such as evaluation scales and performance tests to assess the impact of Parkinson's disease on QoL of affected individuals. The Short Parkinson's Evaluation Scale (SPES) is a reliable and valid tool, applicable both in research and clinical practices, useful in assessing motor damage, activities of daily living, and motor complications in patients with Parkinson's disease. The aim of the study is to investigate validity and reliability of the Italian version of the SPES-SCOPA scale. MethodsTranslation and cultural adaptation were performed. Included patients had diagnosis of Parkinson's disease, no concurrent pathologies, MiniMental test score above 2 and signed informed consent; they were recruited at the Department of Human Neurosciences in Sapienza University of Rome, from February 2023 to November 2023. Test-retest reliability was evaluated through Intraclass Correlation Coefficient (ICC), internal consistency was assessed using Cronbach's Alpha and construct validity using Pearson's correlation between SPES-SCOPA and the gold standard PDQ-39. Results101 patients were recruited. Inter-rater evaluation was conducted on 62 patients, while 39 underwent an intra-rater assessment. The analysis showed statistically significant data with a Cronbach's Alpha value of 0.89 for the entire scale; test-retest reliability results are statistically significant for all subscales. Correlation between PDQ-39 domains and SPES/SCOPA subscales were statistically significant for most measurements. ConclusionThis research shows that the Italian version of SPES-SCOPA scale has excellent psychometric properties.

Towards comprehending internet gaming disorder: evaluating the psychometric properties of the Polish adaptation of the Craving for Internet Gaming Scale.

This study aims to adapt and verify the psychometric properties of the Craving for Internet Gaming Scale (CIGS) in a Polish sample. Craving, although observed as significantly associated with Internet Gaming Disorder, is not currently included in its diagnostic criteria. This research addresses the need for scales to measure craving in this particular context. The research involved a sample of 575 participants. Psychometric analysis, including confirmatory factor analysis, was conducted to assess the CIGS' reliability and validity. Additional scales, such as the Game Transfer Phenomena Scale, Motives for Online Gaming Questionnaire, and the Depression Anxiety Stress Scales, were used for concurrent validity analysis. The study results demonstrate the excellent psychometric properties of the Polish adaptation of the CIGS. It showed high reliability in terms of internal consistency and provided evidence for construct validity. Furthermore, it exhibited a positive correlation with various scales associated with problematic video game use and gaming addiction, while also showing a moderate negative correlation with self-control. Our findings suggest that the CIGS retains its psychometric properties in different cultures, making it a valuable instrument for comprehending craving within the context of Internet gaming disorder. Future research should focus on the adaptation of the CIGS to various cultural settings and the exploration of potential intergroup differences.

Quality of life in individuals with neurofibromatosis type 1 associated cutaneous neurofibromas: validation of the Dutch cNF-Skindex

BackgroundAlmost all patients with Neurofibromatosis type 1 (NF1) develop cutaneous neurofibroma (cNF), benign dermal tumours that have a large impact on the patient’s Quality of Life (QoL). The French cNF-Skindex is the first questionnaire to specifically assess cNF-related QoL in patients with NF1. We aimed to adapt and validate a Dutch version of the cNF-Skindex.MethodsThe questionnaire was translated using forward and backwards translation, and subsequently administered to a sample of 59 patients on two separate occasions. Feasibility was evaluated by the presence of floor/ceiling effects. Reliability was assessed by evaluating internal consistency and test-retest reliability, by calculating Cronbach’s alpha and Spearman’s rank correlation coefficients. The EQ-5D-5L and SF-36 were used to evaluate convergent validity, using Spearman’s rank correlation coefficients. An exploratory factor analysis was performed to study the data’s internal structure. Multivariable linear regression was used to model the relationship between patient characteristics and the cNF-Skindex.ResultsThe Dutch cNF-Skindex demonstrated excellent feasibility and reliability (Cronbach’s alpha 0.96, test-retest correlation coefficient 0.88). Convergent validity was confirmed for the EQ-5D-5L and relevant SF-36 scales. All items and subdomains from the original questionnaire were confirmed following exploratory factor analysis. The patient characteristics included in the multivariable linear regression were not significantly associated with the cNF-Skindex score.ConclusionsThe Dutch cNF-Skindex displayed excellent psychometric properties, enabling use in the Netherlands.

Validity, reliability and responsiveness of a French translation of the Western Ontario Osteoarthritis of the Shoulder index (WOOS)

IntroductionWhile several general questionnaires can be used to evaluate shoulder conditions, very few tools specifically evaluate the impact of shoulder osteoarthritis. The Western Ontario Osteoarthritis of the Shoulder index (WOOS) is a patient-reported outcome measure with excellent psychometric properties intended for patients suffering from shoulder osteoarthritis. Unfortunately, there is no validated French version of this questionnaire. ObjectiveProduce a validated French version of the WOOS that is suitable for the Francophone populations of Europe and North America. Material and methodsA validated protocol was used to create a French version of the WOOS (WOOS-Fr). Included were patients whose first language was French, who could read French and who had shoulder osteoarthritis destined for treatment (surgical treatment=arthroplasty). The WOOS-Fr was compared to the Disability of the Arm, Shoulder and Hand–French translation (F-QuickDASH-D/S) to assess its validity. Reliability and responsiveness were also analyzed. ResultsA French version of the WOOS (WOOS-Fr) was accepted by a multinational committee. The WOOS-Fr was validated in 71 French-speaking subjects. A strong positive correlation was found between the WOOS-Fr and the F-QuickDASH-D/S during the initial evaluation. The intra-class correlation (ICC) of the total WOOS-Fr score indicated good reliability between the initial WOOS and the 1-week WOOS (ICC: 0.84; 95% CI: [0.767; 0.896]; p-value: <0.001) in 57 patients. The responsiveness between the initial WOOS-Fr and at 1 year postoperative was high in the 36 operated patients (standardized mean response of 1.95). DiscussionA French translation of the WOOS questionnaire was created and validated for use in French-speaking populations. This questionnaire will make it easier to evaluate the psychometric results of patients with shoulder osteoarthritis in Francophone countries. Level of evidenceIII; multicenter cohort study.