Table 2.

Pre- and post-test probabilities of depression by result of GP-administered and self-administered depression screening.

		GP-administered depression screening		Self-administered depression screening
	Pre-test Probabilty (%)	Post-test probability if screened positive (%)	Post-test probability if screened negative (%)	Post-test probability if screened positive (%)	Post-test probability if screened negative (%)
Severe depression	8/423	2/78	5/293	8/215	0/205
	(1.9)	(2.6)	(1.7)	(3.7)	(0)
Moderate/severe depression	57/423	21/78	32/293	53/215	4/205
	(13.5)	(26.9)	(10.9)	(24.7)	(2.0)
Mild/moderate/severe depression	150/423	45/78	92/293	122/215	27/205
	(35.5)	(57.7)	(31.4)	(56.7)	(13.2)
No depression	273/423	33/78	201/293	93/215	178/205
	(64.5)	(42.3)	(68.6)	(43.3)	(86.8)

Numbers not equal to 428 as per Table 1 because of missing data.