Web-based tools can be used reliably to detect patients with major depressive disorder and subsyndromal depressive symptoms

Table 1 Demographic data for the ISP-D test, retest, and validity samples

Variables	Test sample (n = 579)	Retest sample (n = 184)*	Validity sample (n = 55)†
Age (years)		NS	P < 0.001
Mean ± SD	26.5 ± 6.6	26.2 ± 6.6	29.7 ± 7.5
Range	18–52	18–49	18–51
Education (years)		NS	NS
Mean ± SD	14.9 ± 2.1	15.2 ± 1.9	15.3 ± 2.0
Range	0–21	9–21	9–18
	%	%	%
Sex		NS	NS
Female	72.7	77.7	76.4
Male	27.3	22.3	23.6
Marital status		NS	NS
Married	18	18.5	23.6
Single	82	81.5	76.4
Employment status		NS	P = 0.027
Employed	51.8	48.4	67.3
Student	39.4	44.6	23.6
Unemployed	8.8	7.1	9.1

* Statistical comparisons were made between retest responders and non-responders. All p values > 0.05.
† Statistical comparisons were made between validity responders and non-responders. P value was shown when p < 0.05.
NS: no significant statistical difference.
ISP-D: Internet-based Self-assessment Program for Depression.

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