TABLE 3.

—“Stage 3” Advertising Impact Coefficients, Use Decision, and Light/Heavy Use Decision: Waves 2, 3, and 4

Equation and Variable	Wave 2	Wave 3	Wave 4
Use Decision
Marijuana
Recall of advertising	−0.183	−0.305	−0.303
	(P = .043)	(P = .005)	(P = .001)
ψMJ	3.429	2.973	3.581
	(z = 19.03)	(z = 15.731)	(z = 20.94)
Log-likelihood	−574.02	−410.19	−659.97
df	864	672	1184
χ2 (P)	538.62 (.0000)	344.31 (.0000)	707.00 (.0000)
Cocaine/crack
Recall of advertising	−0.205	−0.162	−0.421
	(P = .05)	(P = .05)	(P = .000)
ψCC	3.490	2.665	3.600
	(z = 12.59)	(z = 10.13)	(z = 14.60)
Log-likelihood	−333.90	−216.27	−320.75
df	880	700	1211
χ2 (P)	210.71 (.0000)	123.51 (.0000)	308.48 (.0000)
Light/Heavy Use Decision
Marijuana
Recall of advertising	−0.087	−0.086	−0.406
	(P = .273)	(P = .330)	(P = .003)
ψMJ	2.166	1.847	2.263
	(z = 5.73)	(z = 6.81)	(z = 8.00)
Log-likelihood	−214.40	−129.89	−193.90
df	315	191	276
χ2 (P)	48.65 (.0000)	52.19 (.0000)	91.95 (.0000)
Cocaine/crack
Recall of advertising	−0.048	−0.076	−0.289
	(P = .389)	(P = .400)	(P = .127)
ψCC	2.946	2.531	3.004
	(z = 2.45)	(z = 2.00)	(z = 2.97)
Log-likelihood	−60.58	−37.36	−57.71
df	101	73	83
χ2 (P)	9.46 (.0088)	4.41 (.1101)	14.05 (.0009)