Reliability and validity of the Chinese version of the Calgary Depression Scale for Schizophrenia.
OBJECTIVE
The aim of the present study was to determine the reliability and validity of the Chinese version of the Calgary Depression Scale for Schizophrenia (CDSS-C) in schizophrenia patients.


METHODS
One hundred and one inpatients from four mental health units who met DSM-IV criteria for schizophrenia were enrolled. The Positive and Negative Syndrome Scale (PANSS), Hamilton Depression Rating Scale (HDRS-24), Simpson-Augus Rating Scale (SAS), and Barnes Acathisia Rating Scale (BARS) were administered by the first rater, whereas the CDSS-C was assessed by a second independent rater.


RESULTS
The internal consistency (Cronbach's alpha = 0.80) and the inter-rater reliability (kappa coefficient >0.79) were good. The test-retest reliability was high (r = 0.927). The scale had good construct validity, with statistically significant correlations with the HDRS-24, G6 item (depression) of PANSS, and significant weak correlations with the general psychopathology subscale of PANSS. The CDSS-C showed no correlation with the positive and negative subscale of PANSS, the SAS and the BARS.


CONCLUSIONS
The Chinese version of CDSS is a valid and reliable instrument for the assessment of depression in schizophrenia.
Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China.
Weidong
W
Xiao
Hao
H
Liu
Hongyan
H
Zhang
Qi
Q
Liu
Peixin
P
Fu
Jingxu
J
Chen
Xiaoping
X
Wang
Gaohua
G
Wang
Lingzhi
L
Li
Liang
L
Shu
D000328:Adult; D044466:Asian People; D003865:Major Depressive Disorder / Q000175:diagnosis* / Q000453:epidemiology* / Q000523:psychology; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012559:Schizophrenia / Q000453:epidemiology*; D012565:Schizophrenic Psychology; D011795:Surveys and Questionnaires; D014177:Translations