Table 3.

Effect of race on age of first substance class use, controlling for age.

Dependent variable	Independent Variable	Coefficient	Confidence Interval	P-Value
Non-pharmaceutical Opioids	Age	0.17	0.03–0.31	0.015
(N = 157)	Race: White	1.44	−1.66–4.55	0.361
Prescription Opioids (N = 63)	Age	0.28	0.07–0.49	0.010
	Race: White	−5.12	−9.58-−0.67	0.025*
Alcohol/Sedatives (N = 147)	Age	−0.02	−0.09–0.06	0.667
	Race: White	−2.05	−3.73- −0.36	0.017*
Psychedelics (N = 53)	Age	−0.02	−0.16–0.11	0.740
	Race: White	−1.97	−4.90–0.95	0.181
Stimulants (N-138)	Age	0.13	0.003–0.25	0.045
	Race: White	−4.75	−7.45-−2.06	0.001 **
Tobacco (N = 147)	Age	0.004	−0.07–0.08	0.910
	Race: White	−1.50	−3.20–0.21	0.085
Cannabinoids (N = 118)	Age	0.01	−0.45–0.07	0.716
	Race: White	−1.33	−2.53-−0.15	0.028*

^*p < 0.05,

^**p < 0.01,

^***p < 0.001.