Table 10. Comparison of prevalence of obesity and odds ratio for obesity in past smokers stratified by age of smoking cessation.

				Cochran-Mantel-Haenszel trend test		Multiple logistic regression
	Age of smoking cessation(year)	n	BMI	Prevalence of obesity (%)	P value†	Odds ratio*	95% CI	P value
Men	< 30	420	23.2±3.1	22.9	0.41	0.79	0.62–1.01	0.06
	30–39	566	23.7±3.1	29.9		1.03	0.85–1.26	0.74
	40–54	847	23.6±3.1	28.2		1.04	0.87–1.23	0.69
	55 ≤	758	23.0±3.0	24.7		1	0.83–1.21	0.96
Women	<30	214	21.1±2.7	7.9	0.49	0.75	0.44–1.21	0.26
	30–39	151	21.8±3.4	15.9		1.27	0.79–1.95	0.31
	40–54	138	22.2±3.2	21		1.15	0.74–1.71	0.53
	55 ≤	110	23.8±3.6	31.8		1.6	1.05–2.38	0.03

*Prevalence of obesity of never smokers was used as the reference value.

BMI, body mass index

^†Each P value was calculated by Cochran-Mantel-Haenszel trend test among groups stratified by age of smoking cessation in past smokers.