Table 1

Correlation between smoking and BV


BV
No BV
Missing



Yes
All BV
%
Yes
All No BV
%


Total

Smoker 3 mos. before 1st visit
278
764
36.4
1437
7404
19.4
623
OR 2.4 (95% CI 2.0–2.8) *
8791
Smoker at 1st antenatal 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 1st visit
116
774
15.0
575
7577
7.6
440
OR 2.2 (95% CI 1.8–2.7)*
8791
Smoker >10 cig/day at 1st visit
65
774
8.4
227
7577
3.0
440
OR 3.0 (95% CI 2.2–3.9) *
8791

* p < 0.05

Larsson et al. BMC Women's Health 2007 7:20   doi:10.1186/1472-6874-7-20