Table 1. Summary of Suicide Attempt Risk Groups Among a Longitudinal Representative Sample of US Adults^a.

Suicide attempt risk groupb	No. (%)			Within risk group, %c		Mean model-calculated risk scoreb,c
	Projected at-risk individuals based on model-calculated risk scorec	New attempt by wave 2c	No new attempt by wave 2c	Probability of new attempt by wave 2	Probability of no new attempt by wave 2
Low	24 862 (73.1)	32 (14.7)	24 830 (73.4)	0.13	99.87	16.2
Medium	6116 (17.5)	52 (24.6)	6064 (17.5)	0.88	99.12	42.3
High	2945 (7.6)	69 (31.1)	2876 (7.5)	2.57	97.43	62.6
Very high	730 (1.8)	69 (29.6)	661 (1.6)	10.40	89.59	81.9
Total	34 653	222	34 431	0.63c	99.37c	25.5

^aData come from the National Epidemiologic Survey on Alcohol and Related Conditions. Wave 1 was conducted in 2001 and 2002 and wave 2 in 2004 and 2005.

^bRisk scores are based on the out-of-sample classification from the machine learning balanced random forest model. The model provides a continuous risk score for suicide attempt within 3 years between surveys based on wave 1 survey responses. Stratification to 4 risk group categories is described in the eMethods in the Supplement.

^cStatistics presented are raw numbers and weighted percentages, means, and proportions using National Epidemiologic Survey on Alcohol and Related Conditions sampling weights to be representative of the US adult population based on the 2000 Census.