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. 2007 Oct 22;7:20. doi: 10.1186/1472-6874-7-20

Table 1.

Correlation between smoking and BV

	BV			No BV			Missing
	Yes	All BV	%	Yes	All No BV	%			Total
Smoker 3 mos. before 1^stvisit	278	764	36.4	1437	7404	19.4	623	OR 2.4 (95% CI 2.0–2.8) *	8791
Smoker at 1^stantenatal visit	181	774	23.4	802	7577	10.6	440	OR 2.6 (95% CI 2.2–3.1) *	8791
Smoker 1–9 cig/day at 1^stvisit	116	774	15.0	575	7577	7.6	440	OR 2.2 (95% CI 1.8–2.7)*	8791
Smoker >10 cig/day at 1^stvisit	65	774	8.4	227	7577	3.0	440	OR 3.0 (95% CI 2.2–3.9) *	8791

* p < 0.05