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Table 2 Complications of pregnancy by environmental tobacco smoke (ETS). Odds ratio (OR) for ETS and 95% confidence intervals (CI) unadjusted and adjusted for age, active smoking, education and parity. p-values from General Linear Model

From: Environmental tobacco smoke exposure during pregnancy affects complications and birth outcomes in women with and without asthma

 ETSOR (95% CI)ETSAsthmaa
 No (n = 1372)Yes (n = 231)crudeadjustedp-valuep-value
Any Complication580 (42.3%)124 (53.7%)1.58 (1.20–2.09)1.57 (1.18–2.09)0.0020.361
 Vaginal bleeding121 (8.8%)25 (10.8%)1.25 (0.80–1.98)1.28 (0.80–2.07)0.3040.313
 UTI126 (9.2%)29 (12.6%)1.42 (0.92–2.18)1.30 (0.83–2.03)0.2470.584
 Vomiting274 (20.0%)57 (24.7%)1.31 (0.95–1.82)1.32 (0.94–1.85)0.1150.836
 Cerclage11 (0.8%)1 (0.4%)0.54 (0.07–4.19)0.57 (0.05–6.50)0.6331.000
 PE65 (4.7%)13 (5.6%)1.20 (0.65–2.21)1.22 (0.64–2.31)0.5420.260
 Pain ≥3 wk. bef. Delivery43 (3.1%)12 (5.2%)1.69 (0.88–3.26)1.80 (0.93–3.49)0.0830.968
 PROM60 (4.4%)10 (4.3%)0.99 (0.50–1.96)1.04 (0.51–2.10)0.9160.984
 GDM24 (1.7%)9 (3.9%)2.28 (1.04–4.96)2.13 (0.94–4.83)0.0520.882
 Other14 (1.0%)1 (0.4%)0.42 (0.06–3.22)0.47 (0.06–3.62)0.4670.999
  1. UTI urinary tract infection, PE preeclampsia, PROM premature rupture of membranes, GDM gestational diabetes mellitus
  2. ap-value for interaction effect with ETS