Table 6.

Crude odds ratios(95% CI) for respiratory health outcomes associated with ETS by using two-level regression model.

		Dry night cough	Croup	Pneumonia	Frequent common cold
Parental smoking
Pregnancy exposure	Yes/no	1.06(1.01–1.12)*	1.16(1.07–1.26)*	1.07(1.03–1.12)*	1.00(0.94–1.08)
During infancy	Yes/no	1.03(0.97–1.09)*	1.15(1.05–1.25)*	1.05(1.01–1.10)*	0.98(0.91–1.05)
During childhood	Yes/no	1.06(1.00–1.12)*	1.15(1.06–1.26)*	1.07(1.02–1.12)*	0.99(0.92–1.06)
Tobacco odor indoors
During infancy	Sometimes/never	1.24(1.15–1.33)*	1.46(1.31–1.63)*	1.13(1.07–1.20)*	1.16(1.05–1.27)*
	Frequently/never	2.03(1.77–2.33)*	2.31(1.91–2.79)*	1.39(1.23–1.57)*	1.64(1.37–1.95)*
During childhood	Sometimes/never	1.22(1.15–1.31)	1.37(1.24–1.51)*	1.11(1.05–1.17)*	1.11(1.02–1.21)*
	Frequently/never	1.72(1.53–1.93)	1.89(1.61–2.23)*	1.33(1.21–1.47)*	1.54(1.34–1.78)*

*P-value < 0.05.