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Table 3.5.25 Sensitivity and specificity of the Seasonal Health Questionnaire
(SHQ) with structured or semistructured interviews 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
Sensitivity
Specificity
Study quality
Comments
Thompson et al
2004
[101]
United Kingdom
Design
Cross sectional
Setting
Waiting room.
Morning and evening
clinics of two general
medical practices
Population
n=1 041 consecutive patients
n=803 filled the SHQ
Inclusion criteria
Age over 26 years.
Patients were diagnosed
(SAD, reccurent MDD,
MDD, “not depressed”)
based on the SHQ
Index test
SHQ
Reference test
SCID-I (DSM-III-R)
by telephone
Number of patients
n=75
Drop-out rate
25%
Rater of reference test
One psychiatrist
Training of reference test
Trained but not specified
Interobserver reliability
NA
SAD
Sensitivity: 59%
(95% CI, 39; 77)
Specificity: 97%
(95% CI, 85; 99)
Low
Comments
Sampling method
No patients were selected
according to results of the
index test and algorithm is
not available
Blinding
Yes
Handling of missing data
Not reported
25 patients from SAD and
MDD groups were selected
for interview
Prevalence, based on SCID-I
interview with selected patients
SAD: 39% (22/56)
CI = Confidence interval; DSM-III-RR = Diagnostic and statistical manual of mental
disorder, third edition; MDD = Major depressive disorder; NA = Not applicable;
SAD = Seasonal affective disorder; SCID-I = Structured clinical interview for DSM-IV
axis I disorders; SHQ = Seasonal health questionnaire
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