4. Effect estimates and credibility intervals for study‐level covariates.

Covariate	OR	95% CrI
Age (continuous)	1.000	0.999 to 1.001
Cigarettes per day at baseline (continuous)	1.000	0.999 to 1.002
Control arm quit rate (% quit) (continuous)	0.999	0.992 to 1.005
Women (%) (continuous)	1.000	0.999 to 1.000
Length of follow‐up (in months) (6 months vs > 6 months)a	1.005	0.992 to 1.017
Pharmacotherapy (pharmacotherapy vs no pharmacotherapy)	0.985	0.975 to 0.996
Pre‐existing conditions (less healthy vs more healthy)	1.018	0.981 to 1.054
Setting (healthcare vs community)	1.002	0.991 to 1.012
Socioeconomic status (low vs high)	1.008	0.994 to 1.023

^aThis was calculated as a binary variable as opposed to continuous as the data were not normally distributed (positively skewed).
CrI: credibility interval; OR: odds ratio.