Table 2.

Performance of Suicide Risk Screening Methods as Indicators of Suicidal Behavior Among Primary Care Patients

Screening results^{^a}	TP	FP	TN	FN	FP:TP	Sens	Spec	PPV	NPV
30 days postbaseline
PHQ-2 positive	9	468	2104	4	52.0	0.692	0.818	0.019	0.998
PHQ-2 positive + PHQ-9 positive	7	170	2402	6	24.3	0.538	0.934	0.040	0.998
PHQ-2 positive + PHQ-9 positive + SCS item 8 positive	7	114	2458	6	16.3	0.538	0.956	0.058	0.998
PHQ-2 positive + PHQ-9 positive + SCS item 13 positive	7	92	2480	6	13.1	0.538	0.964	0.071	0.998
PHQ-2 positive + PHQ-9 positive + SCS item 16 positive	5	68	2504	8	13.6	0.385	0.974	0.068	0.997
90 days postbaseline
PHQ-2 positive	16	461	2098	10	28.8	0.615	0.820	0.034	0.995
PHQ-2 positive + PHQ-9 positive	13	164	2395	13	12.6	0.500	0.936	0.073	0.995
PHQ-2 positive + PHQ-9 positive + SCS item 8 positive	13	108	2451	13	8.3	0.500	0.958	0.107	0.995
PHQ-2 positive + PHQ-9 positive + SCS item 13 positive	12	87	2471	15	7.3	0.444	0.966	0.121	0.994
PHQ-2 positive + PHQ-9 positive + SCS item 16 positive	10	63	2494	17	6.3	0.370	0.975	0.137	0.993

FN = false negatives; FP = false positives; NPV = negative predictive value; PHQ-2 = 2-item patient health questionnaire; PHQ-9 = 9-item patient health questionnaire; PPV = positive predictive value; Sens = sensitivity; Spec = specificity; SCS = Suicide Cognitions Scale; TN = true negatives; TP = true positives.
↵^aA positive screen on the PHQ-2 corresponds to a total score of 3 or higher, a positive screen on the PHQ-9 corresponds to a score of 1 or higher on item 9, and a positive screen on SCS items 8, 13, and 16 corresponds to a score of 2 or higher on each item.