Minimal detectable change of the Personal and Social Performance scale in individuals with schizophrenia.
The minimal detectable change (MDC) of the Personal and Social Performance scale (PSP) has not yet been investigated, limiting its utility in data interpretation. The purpose of this study was to determine the MDCs of the PSP administered by the same rater or different raters in individuals with schizophrenia. Participants with schizophrenia were recruited from two psychiatric community rehabilitation centers to complete the PSP assessments twice, 2 weeks apart, by the same rater or 2 different raters. MDC values were calculated from the coefficients of intra- and inter-rater reliability (i.e., intraclass correlation coefficients). Forty patients (mean age 36.9 years, SD 9.7) from one center participated in the intra-rater reliability study. Another 40 patients (mean age 44.3 years, SD 11.1) from the other center participated in the inter-rater study. The MDCs (MDC%) of the PSP were 10.7 (17.1%) for the same rater and 16.2 (24.1%) for different raters. The MDCs of the PSP appeared appropriate for clinical trials aiming to determine whether a real change in social functioning has occurred in people with schizophrenia.
Taipei City Psychiatric Center, Taipei City Hospital, Taipei, Taiwan; School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan.
Shu-Chun
SC
Lee
Taoyuan Psychiatric Center, Ministry of Health and Welfare, Taoyuan, Taiwan.
Shih-Fen
SF
Tang
School of Occupational Therapy, Chung Shan Medical University, and Occupational Therapy Room, Chung Shan Medical University Hospital,Taichung, Taiwan.
Wen-Shian
WS
Lu
School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan; Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taipei, Taiwan.
Sheau-Ling
SL
Huang
Taipei City Psychiatric Center, Taipei City Hospital, Taipei, Taiwan.
Nai-Yu
NY
Deng
Taipei City Psychiatric Center, Taipei City Hospital, Taipei, Taiwan.
Wen-Chyn
WC
Lue
School of Occupational Therapy, College of Medicine, National Taiwan University, Taipei, Taiwan; Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital, Taipei, Taiwan. Electronic address: cathy@ntu.edu.tw.
Ching-Lin
CL
Hsieh
D000328:Adult; D005260:Female; D006801:Humans; D007398:Interpersonal Relations; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D012559:Schizophrenia / Q000175:diagnosis*; D012919:Social Behavior
Minimal detectable change; Personal and Social Performance scale; Schizophrenia