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Table 4 Characteristics of pregnancy and pregnancy outcomes 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
Gestational age at delivery (weeks)preterm (< 34)23 (1.7%)8 (3.5%)2.15 (0.94–4.91)2.26 (0.98–5.22)0.2100.459
late preterm (34- < 37)74 (5.4%)16 (6.9%)1.34 (0.76–2.37)1.37 (0.76–2.45)  
early term (37- < 39)299 (21.8%)43 (18.6%)0.89 (0.61–1.29)0.90 (0.61–1.31)  
full term (39- < 41)810 (59.0%)131 (56.7%)1#1#  
late term (41+)166 (12.1%)33 (14.3%)1.23 (0.81–1.86)1.19 (0.77–1.84)  
Method of deliveryVaginal delivery901 (65.7%)148 (64.1%)1#1#  
Cesarean471 (34.3%)83 (35.9%)1.07 (0.80–1.44)1.23 (0.90–1.66)0.1910.032
Apgar 1 min7–101337 (97.4%)217 (93.9%)1#1#  
< 735 (2.6%)14 (6.1%)2.46 (1.30–4.66)2.68 (1.40–5.11)0.0031.000
Apgar 5 min7–101363 (99.3%)226 (97.8%)1#1#  
< 79 (0.7%)5 (2.2%)3.35 (1.11–10.09)3.55 (1.16–10.88)0.0261.000
Birth weight (g)mean ± SD3156 ± 4583110 ± 5041.28 (0.79–2.08)1.23 (0.91–1.66)0.1690.161
Admittance of newbornyes89 (6.5%)25 (10.8%)1.75 (1.10–2.79)1.87 (1.16–3.01)0.0110.541
Anomalyyes6 (0.4%)2 (0.9%)1.99 (0.40–9.91)1.26 (0.21–7.67)0.8000.113
  1. #reference category
  2. ap-value for interaction effect with ETS