Table 3

Choice models

	Model 1: conditional logit		Model 2: latent class logit
Utility function			Class 1 (non-traders)		Class 2
	Coefficient	95% CI	Coefficient	95% CI	Coefficient	95% CI
Opt-out ASC^*	0.6064	0.3274 to 0.8855	5.4439	3.2462 to 7.6417	−1.8744	−2.4692 to −1.2797
Incentive for enrolling	0.0044	0.0016 to 0.0072	0.0126	−0.0103 to 0.0356	0.0049	0.0018 to 0.0081
Incentive for successful benzodiazepine cessation	0.0004	0.0002 to 0.0006	0.0007	−0.0008 to 0.0022	0.0005	0.0003 to 0.0007
Half incentive for reducing dose by half	0.3576	0.1623 to 0.5529	0.8525	−1.2748 to 2.9798	0.3947	0.1825 to 0.6070
Cash rather than lottery	0.7207	0.5213 to 0.9200	1.0786	−0.9806 to 3.1378	0.7362	0.5208 to 0.9517
Probability of class 1 membership
Age in years (continuous)			−0.0098	−0.0485 to 0.0288
Years of use (continuous)			0.0418	0.0002 to 0.0739
Gender (male)			−0.7132	−1.6357 to −0.0093
Education: high school or less			0.2782	−0.5978 to 1.1541
Income: less than US$25 000/year			−0.6573	−1.8428 to −0.0528
Anxiety: severe			−0.0789	−0.0848 to 0.6900
			Class share:	0.355		0.645
N	126

*Alternative-specific constant.