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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Biol Psychiatry. 2014 May 15;76(9):689–697. doi: 10.1016/j.biopsych.2014.04.018

Table 3.

Mixed models regression of subiective reward, negative affect, and positive affect.

Subiective Reward
Predictor Coefficient (C195%) P-Value
DP - AND Abstinent 0-Reference Group
DP - AND Smoking 0.14 (−0.12 to 0.39) p=0.284
DP + AND Abstinent −0.37 (−0.74 to −0.01) p=0.046 Heterogeneity of slopes:
DP + AND Smoking −0.79 (−1.15 to −0.42) p=0.000 χ2(3)=9.37, p=0.025
Day by DP - AND Abstinent β1 0.02 (−0.06 to 0.10) p=0.620
Day by DP - AND Smoking β2 −0.03 (−0.12 to 0.05) p=0.446 Contrast (β3-β4)-(β1-β2):
Day by DP + AND Abstinent β3 −0.04 (−0.14 to 0.06) p=0.472 χ2(1)=6.59, p=0.01
Day by DP + AND Smoking β4 0.15 (0.05 to 0.25) p=0.003
Negative Affect
DP - AND Abstinent 0-Reference Group
DP - AND Smoking 0.61 (−0.09 to 1.30) p=0.087
DP + AND Abstinent 2.73 (1.18 to 4.28) p=0.001 Heterogeneity of slopes:
DP + AND Smoking 6.08 (4.53 to 7.63) p=0.000 χ2(3)=25.47, p<0.001
Day by DP - AND Abstinent β1 0.06 (−0.17 to 0.29) p=0.601
Day by DP - AND Smoking β2 −0.29 (−0.52 to −0.06) p=0.013 Contrast (β3-β4)-(β1-β2):
Day by DP + AND Abstinent β3 0.30 (0.03 to 0.57) p=0.033 χ2(1)=4.470, p=0.035
Day by DP + AND Smoking β4 −0.60 (−0.87 to −0.33) p=0.000
Positive Affect
DP - AND Abstinent 0-Reference Group
DP - AND Smoking 0.59 (0.01 to 1.16) p=0.045
DP + AND Abstinent −1.39 (−2.77 to −0.01) p=0.048 Heterogeneity of slopes:
DP + AND Smoking −2.76 (−4.14 to −1.38) p=0.000 χ2(3)=10.67, p=0.014
Day by DP - AND Abstinent β1 0.05 (−0.13 to 0.24) p=0.578
Day by DP - AND Smoking β2 −0.12 (−0.31 to 0.07) p=0.207 Contrast (β3-β4)-(β1-β2):
Day by DP + AND Abstinent β3 −0.10 (−0.33 to 0.12) p=0.376 χ2(1)=8.20, p=0.004
Day by DP + AND Smoking β4 0.33 (0.10 to 0.55) p=0.004