Table 2. Top 20 Most Important Variables Based on Suicide Attempt Model Using 2985 Features Collected from the National Epidemiologic Survey on Alcohol and Related Conditions Wave 1 Responses^a.

Description	Importance scoreb
Felt like wanted to die	100
Thought about committing suicide	48.425
Attempted suicide	21.932
During past 4 wk, how often felt downhearted and depressed	14.033
Age	13.731
During past 4 wk, how often did work or other activities less carefully than usual as result of emotional problems	13.051
Experienced major financial crisis, bankruptcy, or been unable to pay bills on time in last 12 mo	11.478
During past 4 wk, how often accomplished less than would like as result of emotional problems	11.213
Grade level during 2000-2001 school year	10.319
Highest grade or year of school completed	7.938
During past 4 wk, how often physical health or emotional problems interfered with social activities	7.746
Blood/natural father ever an alcoholic or problem drinker	7.377
Occupation: current or most recent job	6.059
Current marital status	4.727
Family income in last year	4.472
Age when biological/adoptive parents stopped living together	4.471
Thought a lot about own death	4.135
Present situation includes in school part time	4.128
Personal income in last year	4.122
Parent lived with after biological or adoptive parents stopped living together	4.037

^aNESARC wave 1 was conducted in 2001 and 2002 and wave 2 in 2004 and 2005.

^bThe importance score was calculated by permuting the labels and estimating the decrease in classification performance.