TABLE 2.

Number of cigarettes smoked per day and motivation to stop smoking.

	Packs of ≥ 25	Packs of 20	Mean difference b (95% CI) (packs of ≥ 25 minus packs of 20)	P	Cohen's d
	Mean a (SD)	Mean a (SD)
Number of cigarettes smoked per day
Primary analysis c	16.9 (7.1)	15.7 (7.1)	−1.3 (−1.7, −0.9)	< 0.001	0.81
Per protocol analysis d	17.2 (7.1)	16.0 (7.1)	−1.3 (−1.7, −0.8)	< 0.001	−0.79
Sensitivity analysis 1 1	16.9 (7.1)	15.6 (7.1)	−1.2 (−1.6, −0.8)	< 0.001	−0.76
Sensitivity analysis 2 2	16.8 (7.1)	15.6 (7.1)	−1.3 (−1.7, −0.9)	< 0.001	−0.81
Sensitivity analysis 3 3	16.9 (7.1)	15.7 (7.1)	−1.1 (−1.5, −0.7)	< 0.001	−0.69
Motivation to stop smoking e	3.1 (1.3)	3.1 (1.2)	−0.3 (−0.4, −0.1)	0.002	−0.41

CI, confidence interval; SD, standard deviation.

^a Unadjusted;

^b adjusted for pre‐specified covariates (baseline consumption and heaviness of smoking at enrolment);

^c n = 236;

^d n = 215;

^e Motivation To Stop Smoking Scale [range = 1 (I do not want to stop smoking) to 7 (I REALLY want to stop smoking)]; n = 238.

¹ Data were analysed with no imputation for missing values (and without any of the assumptions required for this); n = 224.

² Data were analysed as per the primary analysis, but missing values imputed for up to two cigarette packs classed as Primary‐missing; n = 237.

³ Data were analysed as per the primary analysis, with an additional covariate: self‐reported mitigating factors impacting on cigarette consumption; n = 235.