The reliability, validity, and applicability of an English language version of the Mini-ICF-APP
Molodynski A., Linden M., Juckel G., Yeeles K., Anderson C., Vazquez-Montes M., Burns T.
Purpose: This study aimed at establishing the validity and reliability of an English language version of the Mini-ICF-APP. Methods: One hundred and five patients under the care of secondary mental health care services were assessed using the Mini-ICF-APP and several well-established measures of functioning and symptom severity. 47 (45 %) patients were interviewed on two occasions to ascertain test-retest reliability and 50 (48 %) were interviewed by two researchers simultaneously to determine the instrument's inter-rater reliability. Occupational and sick leave status were also recorded to assess construct validity. Results: The Mini-ICF-APP was found to have substantial internal consistency (Chronbach's α 0.869-0.912) and all 13 items correlated highly with the total score. Analysis also showed that the Mini-ICF-APP had good test-retest (ICC 0.832) and inter-rater (ICC 0.886) reliability. No statistically significant association with length of sick leave was found, but the unemployed scored higher on the Mini ICF-APP than those in employment (mean 18.4, SD 9.1 vs. 9.4, SD 6.4, p < 0.001). The Mini-ICF-APP correlated highly with the other measures of illness severity and functioning considered in the study. Conclusions: The English version of the Mini-ICF-APP is a reliable and valid measure of disorders of capacity as defined by the International Classification of Functioning. Further work is necessary to establish whether t he scale could be divided into sub scales which would allow the instrument to more sensitively measure an individual's specific impairments. © 2012 Springer-Verlag Berlin Heidelberg.