Table 5.

Analysis summary of the parameters studied and their outcome.

Outcome	Varenicline N	Placebo N	Estimate		95% CI	Q
			Type	Effect
Cigarettes/day	133	94	SMD	0.89***	0.57, 1.22	1.33
Expired carbon monoxide	49	51	SMD	0.50*	0.06, 0.94	0.22
Abstinence	88	47	Log OR	1.81*	0.41, 3.20	0.57

N, number; SMD, standardized mean difference; OR, Odds Ratio; CI, confidence intervals;

^*p < 0.05;

^***p < 0.001.