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Table 3.5.32 Calgary Depression Scale for Schizophrenia (CDSS)
for assessment of severity of depression with DSM-IV criteria or
CGI-S as reference standard.
Author
Year
Reference
Country
Study design
Setting
Population
Inclusion & exclusion criteria
Prevalence
Index test
Reference test
Number of patients
Drop-out rate
Rater
Rater training
Interobserver reliability
Correlation
Study quality
Comments
Müller et al
2006
[135]
Germany
Design
Cross sectional
Setting
Psychiatric clinic in Germany
Population
n=119 inpatients
(38% females) with
schizophrenia
Mean age: 31.9 years
(SD 10.7)
Inclusion criteria
Stabilized acute schizophrenia
Prevalence (reference test)
31% no depression
19% mild depression
31% moderate depression
19% severe depression
Index test
CDSS
Reference test
Global 4-point depression
severity rating (DEP-SEV)
based on CGI-S ratings +
DSM-IV criteria for MDD
with modifications that
severity was rated independently
of psychotic
features and a time frame
of 1 week
Number of patients
n=119
Drop-out rate
Not reported
Rater of index test
5 experienced psychiatrists
Training of index rater
Continuous rater training
Rater of reference test
Same 5 experienced
psychiatrists
Training of reference test
Continuous rater training
Interobserver reliability
ICC ≥0.87 for CDSS
and DEP-SEV
CDSS vs DEP-SEV
r=0.80 (p