Table 2.

Suicide Risk Index Implemented to Predict Suicide Ideation and Attempts During 48 mo

	Probability of Suicide Ideation, 6–48 mo (n = 529)a		Probability of Suicide Attempt, 6–48 mo (n = 529)b
Risk category (variables measured at baseline)	% (n)	OR (95% CI)c	% (n)	OR (95% CI)d
Low (n = 169): no history of suicide attempt at baseline and having no more than 2 risk factors (ie, older than 28 years at admission, SAPS [disorganization] below 5.5, no substance abuse history, and depression scores < 18)	12.4 (21/169)	—	4.1 (7/169)	—
Intermediate (n = 212): no history of suicide attempt at baseline and having 3 or more other risk factors	23.1 (49/212)	1.90 (1.14–3.18)	9.9 (21/212)	2.42 (1.03–5.70)
High (n = 148): history of suicide attempt and 1 or more risk factors	52.0 (77/148)	4.91 (3.02–7.96)	29.7 (44/148)	7.97 (3.59–17.70)

Note: OR = odds ratio, CI = confidence interval, SAPS = Scale for the Assessment of Positive Symptoms.

^aIn the subsequent ideation model, the 3 groups were also dichotomized into low and intermediate vs high categories, OR = 4.81, CI = 3.18–7.28. Sensitivity, specificity, and positive predictive values are as follows: 52.3%, 18.5%, and 52.0%, respectively.

^bIn the subsequent attempts model, the 3 groups were also dichotomized into low and intermediate vs high categories, OR = 5.33, CI = 3.16–8.98. Sensitivity, specificity, and positive predictive values are as follows: 61.1%, 22.7%, and 29.7%, respectively.

^cCox regression predicting subsequent ideation, with risk index entered as a categorical variable with simple contrast. Omnibus Test of Model Coefficients (likelihood ratio) was significant (−2 log likelihood = 1746.43), overall score: χ² = 56.19, df = 3, P < .001.

^dCox regression predicting subsequent attempts, with risk index entered as a categorical variable with simple contrast. Omnibus Test of Model Coefficients (likelihood ratio) was significant (−2 log likelihood = 834.420), overall score: χ² = 48.79, df = 3, P < .001.