Turkish validity and reliability study of the Weiss Functional Impairment Rating Scale-Parent Report

Abstract

Attention deficit hyperactivity disorder (ADHD) is seen frequently in childhood and leads to marked impairment in functioning. There is no scale in Turkey with documented validity and reliability that assesses ADHD-specific functional impairment (FI). This study aimed at adapting the Weiss Functional Impairment Rating Scale-Parent Report (WFIRS-P), which assesses ADHD-related FI, for use in Turkey, and examining psychometric aspects of the scale. The study included 250 children diagnosed with ADHD and 250 healthy children and their parents. Internal consistency and test-retest methods were used to test the reliability of the scale. Validity was tested with exploratory and confirmatory factor analyses and convergent and discriminant validity analyses. Since all six questions of the WFIRS-P were scored 0, analyses were conducted for the original scale questionnaire consisting of 50 items and the questionnaire consisting of 44 items where the six questions scored 0 were not included. The Cronbach's alpha coefficient was 0.93 for the whole scale. The Spearman's correlation coefficient was 0.93 for test-retest reliability. The exploratory factor analysis run on the 44-item questionnaire showed that the scale items were best represented in a 7-factor structure, but some items were placed in different subdomains than those of the original scale. In the confirmatory factor analysis, the root mean square error of approximation was 0.061, and the comparative fit index was 0.95 for the whole model. Therefore, the Turkish WFIRS-P is valid and reliable in testing functional impairment in children with ADHD.

Does Guanfacine Extended Release Impact Functional Impairment in Children with Attention-Deficit/Hyperactivity Disorder? Results from a Randomized Controlled Trial

“…Mean changes in domain scores were significantly different between responder and non-responder groups in the hypothesized direction. These results were also largely replicated in an independent validation of a translated version of the WFIRS-P in Turkish children [ 7 ], and other studies utilizing the WFIRS have noted good reliability of the scale [ 8 , 9 ]. The WFIRS-P has been used to examine functional impairment in observational studies [ 10 ], treatment studies of psychoeducational training [ 11 ], behavioral therapy in a summer treatment program [ 11 ], and clinical trials of lisdexamfetamine dimesylate (LDX) [ 12 ] and atomoxetine [ 13 ] pharmacotherapy.…”

“…Total and domain/subdomain scores, respectively, were the mean item scores across the whole scale or in each domain/subdomain. The WFIRS-P has been reported to have internal consistency and sensitivity to change [ 6 , 7 , 19 , 20 ], and shows positive correlations with measures of ADHD symptoms and functioning [ 8 ].…”

Preschool hyperactivity specifically elevates long-term mental health risks more strongly in males than females: a prospective longitudinal study through to young adulthood

“…It comprises six subsections: home (8 items); learning and work (12 items); activities of daily living (14 items); self-concept (4 items); social activities (6 items); and risky activities (13 items). It forms part of the Canadian ADHD Resource Alliance (CADDRA) toolkit and has been psychometrically validated for use in the ADHD population [60, 61]. …”

Behavioural sleep problems in previously untreated children with attention deficit hyperactivity disorder

“…The scale is divided into seven subscales as family, school, behaviour, life skills, child's sense of self, social activities, and risky actions. The Turkish validity and reliability of the form has been performed [29].…”