Table 3.

Results of multivariable, mixed‐effects regression analysis.

Variable	Odds ratio (95% CI)	P‐value
Treatment versus control	0.94 (0.74, 1.19)	0.597
Age (years)	1.01 (1.00, 1.02)	0.006
Sex: female versus male	0.94 (0.73, 1.21)	0.626
Married or living with a partner versus all other	1.50 (1.15, 1.96)	0.003
Education up to GCSE versus A‐level or above	0.94 (0.73, 1.22)	0.656
Unemployed versus all other	0.67 (0.43, 1.06)	0.090
Free prescription versus no free prescription	0.93 (0.71, 1.23)	0.626
Living with a smoking partner versus not	0.82 (0.59, 1.14)	0.231
Cigarettes per day before quitting: <10 versus ≥10	1.73 (1.22, 2.44)	0.002
First cigarette within 5 minutes after waking versus ≥ 5 minutes	0.77 (0.60, 0.99)	0.046
Any previous quit attempts vs. no previous quit attempts	0.72 (0.45, 1.14)	0.161
Longest time managed to quit before: > 4 weeks versus ≤ 4 weeks	0.89 (0.64, 1.23)	0.483
Specialist service versus non‐specialist service	1.46 (1.09, 1.97)	0.012

Prolonged smoking abstinence was the dependent variable, and multiple baseline characteristics as independent variables. Odds ratio > 1 indicates that a variable is associated with a higher rate of smoking abstinence. GCSE = General Certificate of Secondary Education; CI = confidence interval.