Table 4.

Sensitivity and specificity of ICD-9 codes^* for depression and alcohol misuse to predict self-report of depression (PHQ-8),^15–16 current problem drinking (AUDIT-C),^18–21 and ever daily binge drinking.

	Specificity (%)	Sensitivity (%)	Positive predictive value (%)	Negative predictive value (%)
Depression (PHQ-8)
Case definition 1	87.9	32.9	52.5	76.3
Case definition 2	69.9	54.2	43.6	78.0
Case definition 3	59.3	64.5	40.5	79.5
Alcohol misuse
Current problem drinking (AUDIT-C)
Case definition 1	97.5	9.2	47.2	81.8
Case definition 2	87.8	24.0	33.9	81.6
Case definition 3	80.2	34.6	31.3	82.5
Ever daily binge drinking
Case definition 1	98.4	7.1	75.0	61.4
Case definition 2	91.2	22.8	64.5	62.7
Case definition 3	84.0	32.6	58.9	63.9

^*See Table 1 footnotes for ICD-9 codes.