Table 7. Comparison of prevalence of obesity and odds ratio for obesity in female smokers stratified by cigarettes smoked per day (CPD).

				Cochran-Mantel-Haenszel trend test		Multiple logistic regression
Smoking status	CPD	n	BMI	Prevalence of obesity (%)	P value†	Odds ratio*	95% CI	P value
Current	≤ 10	645	21.4±3.2	12.1	0.08	0.9	0.70–1.15	0.42
	11–20	608	21.5±3.3	14.8		1.04	0.82–1.31	0.73
	20 <	71	23.0±3.9	22.5		1.61	0.88–2.78	0.12
Past	≤ 10	372	21.6±3.1	14.5	0.07	1.02	0.75–1.37	0.89
	11–20	214	22.4±3.4	19.2		1.29	0.90–1.82	0.16
	20 <	44	23.4±4.0	31.8		2.05	1.04–3.85	0.039

*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 CPD in current or past smokers.