Table 2.

Mood Levels and Variability Before Cigarette Use with Cannabis and/or Alcohol as Compared with Before Use of Cigarettes Only

	Positive affect			Negative affect
	Estimate	SE	p	Estimate	SE	p
Mean model
Intercept β 0	6.722	0.197	<.0001	3.472	0.228	<.0001
Male β 1	0.173	0.192	.37	-0.278	0.219	.21
Timepoint β 2	0.009	0.091	.92	0.135	0.119	.26
Between-subjects effects
Polysubstance use β 3	0.444	0.821	.59	0.078	0.931	.93
Cigarettes with cannabis β 4	0.722	0.445	.11	–0.198	0.510	.70
Cigarettes with alcohol β 5	1.189	0.449	<.01	–0.738	0.532	.17
Within-subjects effects
Polysubstance use β 6	0.502	0.121	<.0001	–0.073	0.093	.43
Cigarettes with cannabis β 7	0.320	0.056	<.0001	–0.179	0.041	<.0001
Cigarettes with alcohol β 8	0.262	0.065	<.0001	–0.030	0.059	.61
Variance model (exp.)
Intercept τ 0	1.778	0.249	<.0001	1.922	0.359	<.001
Male τ 1	0.741	0.098	<.05	0.648	0.115	<.05
Timepoint τ 2	0.831	0.049	<.01	0.884	0.055	.05
Between-subjects effects
Polysubstance use τ 3	3.478	2.430	.08	1.599	1.633	.65
Cigarettes with cannabis τ 4	0.988	0.333	.97	1.275	0.565	.58
Cigarettes with alcohol τ 5	0.876	0.372	.76	1.273	0.687	.66
Within-subjects effects
Polysubstance use τ 6	1.395	0.205	<.05	1.374	0.207	<.05
Cigarettes with cannabis τ 7	1.114	0.092	.19	0.794	0.068	<.01
Cigarettes with alcohol τ 8	1.079	0.109	.45	1.022	0.103	.83

Positive and negative affect were rated on a 10-point scale. P-values were based on Wald statistics (Estimate/SE ~ standard normal distribution). Variance model estimates were exponentiated to represent variance ratios; the corresponding p-values reflected tests of variance ratios equaling one. Polysubstance use indicated events with cigarettes, cannabis, and alcohol.