Table 3. Odd ratios of active, passive and electronic cigarette smoking for atopic dermatitis (recent 12 months) using multiple logistic regression analysis with complex sampling (Reference = no smoking).

Smoking	OR	95% CI	P-value
Active Smoking
Unadjusted			0.088
0 day a month	1.00
1–19 days a month	1.05	0.95–1.16
≥ 20 days a month	1.09	1.00–1.18
Model 1†			<0.001*
0 day a month	1.00
1–19 days a month	1.14	1.03–1.26
≥ 20 days a month	1.22	1.12–1.32
Model 2‡			<0.001*
0 day a month	1.00
1–19 days a month	1.13	1.02–1.25
≥ 20 days a month	1.22	1.13–1.33
Model 3§			0.002*
0 day a month	1.00
1–19 days a month	1.11	0.99–1.23
≥ 20 days a month	1.18	1.07–1.29
Passive Smoking
Unadjusted			<0.001*
0 day a week	1.00
1–4 days a week	1.09	1.04–1.15
≥ 5 days a week	1.20	1.12–1.27
Model 1†			<0.001*
0 day a week	1.00
1–4 days a week	1.09	1.04–1.14
≥ 5 days a week	1.17	1.10–1.25
Model 2‡			<0.001*
0 day a week	1.00
1–4 days a week	1.09	1.03–1.14
≥ 5 days a week	1.15	1.08–1.23
Model 3§			<0.001*
0 day a week	1.00
1–4 days a week	1.08	1.03–1.13
≥ 5 days a week	1.12	1.05–1.20
Electronic Cigarettes Smoking
Unadjusted
No	1.00
Yes	1.02	0.95–1.09	0.685
Model 1†
No	1.00
Yes	1.14	1.06–1.23	<0.001*
Model 2‡
No	1.00
Yes	1.14	1.06–1.23	<0.001*
Model 3§
No	1.00
Yes	1.03	0.95–1.12	0.436

* Significance at P < 0.05.

^† Adjusted for age and sex.

^‡ Adjusted for age, physical exercise, sex, obesity, region of residence, economic level, educational level of father, and education level of mother.

^§ Adjusted for age, physical exercise, sex, obesity, region of residence, economic level, educational level of father, education level of mother, active, passive smoking, and electronic cigarettes smoking.