TABLE 1.

—Wave 1 Probits on Probabilities of Marijuana and Cocaine/Crack Use

	Coefficient	SE	z (β/SE)	P (Z > z)
Marijuana Usea
Constant	0.4343	. . .	. . .	. . .
Attitude toward drugs	−0.5719	0.1093	−5.233	0.000
Perceived severity	−0.2854	0.0870	−3.280	0.001
Attitude toward users	−0.2043	0.5808	−0.352	0.363
Peer pressure	0.6479	0.0801	8.086	0.000
Perceived susceptibility	−0.3085	0.0954	−3.232	0.001
Previous addiction	0.8349	0.3423	2.439	0.007
Availability	0.0901	0.0542	1.664	0.048
Urban residence	0.0860	0.1587	0.542	0.588
Male	0.1675	0.1438	1.165	0.244
Race	0.4100	0.2116	1.938	0.053
Cocaine/Crack Useb
Constant	5.0748	. . .	. . .	. . .
Attitude toward drugs	−0.5279	0.1480	−3.567	0.000
Perceived severity	−0.4407	0.1309	−3.366	0.001
Attitude toward users	0.0731	0.6707	0.109	0.457
Peer pressure	0.6592	0.1134	5.814	0.000
Perceived susceptibility	−0.3891	0.1437	−2.709	0.004
Previous addiction	2.2655	0.5876	3.856	0.000
Availability	0.0991	0.0869	1.151	0.125
Urban residence	0.2870	0.2535	1.132	0.258
Male	0.3205	0.2371	1.352	0.177
Race	0.0198	0.3397	0.058	0.954
Decision independence	0.8549	0.1854	4.612	0.000

^aNo. of observations = 642, log-likelihood = −402.87, χ² = 383.54 (P = .0000).

^bNo. of observations = 630, log-likelihood = −202.60, χ² = 232.85 (P = .0000).