Table 4.

Abstinence and smoking reduction as predicted by demand indices derived from the two-part mixed effects model.

Abstinence at 6 months
Demand indices	Odds ratio	95% CI	Type III test statistics	p-value
Intensity	1.01	(0.99, 1.03)	0.84	.36
Omax	1.00	(0.99, 1.01)	0.27	.60
Pmax	1.02	(0.95, 1.10)	0.37	.54
α	1.17	(0.64, 2.15)	0.26	.61
Breakpoint	1.01	(0.98, 1.04)	0.64	.64
Percent reduction in cigarettes per day among smokers at 6 months
Demand indices	β	95% CI	Type III test statistics	p-value
Intensity	−4.4%	(−5.4%, −3.3%)	71.40	<.0001
Omax	−0.2%	(−0.4%, 0.0%)	2.83	.09
Pmax	0.0%	(−3.7%, 3.9%)	0.00	.96
α	−2.5%	(−34%, 29%)	0.02	.88
Breakpoint	−4.1%	(−5.6%, −2.6%)	29.17	<.0001

Note. For abstinence, odds ratio and Wald chi-square test statistics from logistic regression were reported; for smoking reduction, regression coefficient β and F test statistics, F(1, 718) from linear regression were reported.