Table 1.

Multilevel Model of Percentage of Choices for Cigarette Puffs Across Values of Alternative Reinforcers

Predictor	Β	SE	P	95% CI
Intercept	53.68	4.06	<.001	45.61% to 61.76%
Gender	14.84	6.06	.016	2.79% to 26.89%
Baseline smoking	1.59	0.66	.019	0.27% to 2.91%
Slope
Alternative reinforcer valuea	−45.76	8.42	<.001	−62.50% to −29.02%
Gender × reinforcer value	−27.02	12.56	.034	−52.00% to −2.04%
Baseline smoking × reinforcer	−2.84	1.37	.042	−5.57% to −0.10%

CI = confidence interval.

^aThe effects of alternative reinforcer values ($0.00, $0.10, and $0.50) were examined across sessions.