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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Drug Alcohol Depend. 2010 Dec 30;116(1-3):37–44. doi: 10.1016/j.drugalcdep.2010.11.017

Table 5.

Estimates and 95% CIs for Additive Genetic (A), Shared Environmental (C) and Non-shared Environmental (E) Influences on Individual Differences in the Smoking Expectancy Factors.

Negative Affect Reduction Boredom Reduction Weight Control Taste Manipulation Craving / Addiction Stimulation-state Enhancement
A 0.008 (0.00–0.38) 0.38 (0.06–0.47) 0.14 (0.00–0.39) 0.03 (0.00–0.36) 0.23 (0.00–0.38) 0.32 (0.00–0.42)
C 0.29 (0.00–0.39) 0.00 (0.00–0.28) 0.15 (0.00–0.28) 0.22 (0.00–0.28) 0.05 (0.00–0.31) 0.004 (0.00–0.32)
E 0.71 (0.60–0.81) 0.62 (0.53–0.73) 0.71 (0.61–0.83) 0.74 (0.63–0.84) 0.73 (0.62–0.85) 0.68 (0.58–0.80)

Note: Estimates in bold font are significantly different from zero. Either A or C could be dropped with no statistically significant deterioration in the fit of the model for each expectancy except Boredom Reduction (all p > .05). However, dropping both A and C resulted in a significant deterioration in the fit of these models (all p < .001). For Boredom Reduction, dropping A resulted in a significant deterioration in model fit χ2(1)= 5.12, p < .05, but dropping C did not χ2(1)= 1.0, p > .05. For Boredom Reduction, the parameter estimates and 95% CIs for the best fitting model were A = 0.38 (0.27–0.47) and E = 0.62 (0.53–0.73).