Table 2 Results from the meta-analysis for smoking cessation stratified by different data sets

Data set of meta-analysis (A1A1+A1A2 vs A2A2)	Cohorts (n)	Sample size (N)	Estimate of heterogeneity		Fixed-effects model			Random-effects model			B^a
			I²(%)	P (Q)	Pooled OR	95% CI	P (Z)	Pooled OR	95% CI	P (Z)	P (B)
Cross-sectional data set^b	10	4457	53.8	0.02	1.12	0.99–1.27	0.07	1.03	0.81–1.30	0.84	0.35
Cross-sectional data set^c	5	3737	57.0	0.05	1.19	1.04–1.36	0.01	1.12	0.87–1.45	0.38	0.62
Cross-sectional data set^d	4	3378	0	0.97	1.27	1.10–1.46	0.001	1.27	1.10–1.46	0.001	0.50
Longitudinal data set^e	14	6694	11.4	0.33	1.20	1.06–1.36	0.003	1.20	1.05–1.37	0.007	0.87
Longitudinal data set^f	13	6469	6.1	0.39	1.18	1.04–1.34	0.01	1.18	1.03–1.34	0.01	0.62
Combined data set^g	24	11 151	33.9	0.055	1.16	1.06–1.27	0.0008	1.13	1.00–1.27	0.04	0.40
Combined data set^h	18	10 206	23.0	0.18	1.18	1.08–1.30	3 × 10⁻⁴	1.16	1.04–1.30	0.009	0.44
Combined data setⁱ	17	9847	0.0	0.63	1.22	1.11–1.34	3.9 × 10⁻⁵	1.22	1.11–1.34	3.9 × 10⁻⁵	0.53
Combined data set^j	4	945	72.8	0.01	0.97	0.72–1.32	0.86	1.05	0.56–1.96	0.88	0.68

Abbreviations: CI, confidence interval; OR, odds ratio.
^aEgger regression test for publication bias.
^bAnalysis of cross-sectional data extracted from all the cross-sectional surveys.
^cAnalysis of cross-sectional data based on Caucasian population.
^dAnalysis of cross-sectional data based on Caucasian population without the data of the Gordiev study.
^eAnalysis of longitudinal data extracted from all the longitudinal studies.
^fAnalysis of longitudinal data extracted based on Caucasian population.
^gAnalysis of combined data extracted from both the cross-sectional surveys and the longitudinal studies.
^hAnalysis of combined data based on Caucasian population.
ⁱAnalysis of combined data based on Caucasian population without the data of the Gordiev study.
^jAnalysis of combined data based on Asian population.

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