TABLE 4. Multiple Logistic Regression Analysis (with Simultaneous Entry of Covariates) Examining Correlates of Lifetime Nitrous Oxide Use in the Total Sample of 723 Youth in Residential Treatment.

Variables	AOR	95% CI
Race/Ethnicity	1.02	.78 – 1.33
Family Receipt of Welfare	.58	.33 – 1.02
SRD-Total Delinquency Score*	.98	.97 – 1.00
Prior Receipt of a Mental Illness Diagnosis	1.91	1.07 – 3.42
BSI- Global Severity Index	1.01	1.00 – 1.02
PPI-Fearlessness	1.10	1.04 – 1.16
PPI-Impulsive Nonconformity	1.03	.96 – 1.09
APSD Total	.95	.90 – 1.00
MAYSI Suicide Ideation Scale	.99	.88 – 1.12
MAYSI-2 Traumatic Experiences Scale	.89	.73 – 1.09
Total Number of Drug Types Used	1.73	1.55 – 1.94

^*Note: AOR = Adjusted odds ratio, CI = Confidence interval, SRD = Self-Report of Delinquency Scale, BSI = Brief Inventory Scale, APSD = Antisocial Process Screening Device, MAYSI = Massachusetts Youth Screening Inventory. Adjusted odds rations in bold are significant based on a 95% confidence interval that does not bound the value 1.00.