Table 3.

Odds ratios (OR) and 95% confidence intervals (CI) of habitual snoring before and during pregnancy according to maternal history of asthma, Seattle, Washington, USA, 2003–2006

	Asthma Diagnosis
	Yes N=200	No N=1,135	Unadjusted OR (95% CI)	Adjusted* OR (95% CI)
Maternal Snoring	%	%
Habitual Snoring Before Pregnancy
No	91.0	95.9	1.00 (Reference)	1.00 (Reference)
Yes	7.0	3.2	2.32 (1.23–4.40)	2.13 (1.10–4.12)
Habitual Snoring During Pregnancy
No	84.0	91.5	1.00 (Reference)	1.00 (Reference)
Yes	11.0	6.4	1.86 (1.13–3.08)	1.79 (1.07–3.01)

^*Adjusted for maternal age (continuous), parity (categorical), and pre-pregnancy body mass index (continuous) Column percentages do not add up to 100% due to missing values