Table 1.

Time-constant coefficient estimates of Model 1 (time-varying effect model of regressing cessation fatigue on craving and negative affect, adjusting for lapse and baseline dependence)

Covariate	Estimate (SD)	p-value
Intercept	2.53 (0.04)	<.0001
Intercept*time	0.02 (0.01)	0.0007
Craving	0.24 (0.04)	<.0001
Craving*time	0.05 (0.01)	<.0001
Lapse	0.28 (0.08)	0.0005
Baseline dependence	0.08 (0.02)	<.0001

Intercept, craving and their interactions with time are shown in the constant effects table because these terms were chosen to be of parametric forms in model selection procedure of TVEM. The corresponding plots are the left and middle panels of Fig. 2. The coefficient of NA is not included in this table because it was decided by the model selection procedure of TVEM to be a nonparametric curve with two knots. The inference for NA can be drawn from the right panel of Fig. 2.