Table.

Incremental gain of the Yale-Brown obsessive compulsive scale in confirming or excluding the presence of depression in stroke inpatients two weeks after stroke

Assumed prevalence of depression	Test positive			Test negative
	Predictive value	Incremental gain (%)		Predictive value	Incremental gain (%)
90%	0.97	7		0.38	28
80%	0.94	14		0.58	38
70%	0.90	20		0.70	40
60%	0.85	25		0.79	39
50%	0.80	30		0.85	35
40%	0.72	32		0.89	29
30%	0.63	33		0.93	23
20%	0.49	29		0.96	16
10%	0.30	20		0.98	8