Objective: The aim of this study was to demonstrate the validity and
reliability of the WFIRS-S-TR, Turkish version of the Weiss Functional
Impairment Rating Scale-Self Report form.
Method: The study comprised two groups of participants of 15-18
years of age, one consisting of 35 children diagnosed with attention
deficit and hyperativity disorder (ADHD) based on the DSM-IV
criteria and the other, 510 healthy volunteers attending high school.
Apart from the WFIRS-S-TR, the Health Questionnaire for Children
and Adolescents (KIDSCREEN-10 Index) which is a general quality of
life and functionality measurement instrument, was used to check the
concurrent validity of the WFIRS-S-TR.
Results: The Cronbach’s alpha coefficient for the total scale was
0.939. The test-retest reliability assessed by repeated measurements
two weeks apart gave a high correlation between the results (r=0.804,
p<0.0001). Total mean score of the WFIRS-S-TR showed significant
correlation with the KIDSCREEN-10 Index total mean score (r=
-0.467, p<0.0001). Confirmatory factor analysis was carried out for
the construct validity of the WFIRS-S-TR. The RMSEA and the CFI
values were found to be 0.065 and 0.68, respectively.
Conclusion: The WFIRS-S-TR can be used as a valid and reliable tool
both in clinical practice and for research purposes.