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Table 1 Characteristics of women according to alcohol intake in early pregnancy

From: Behavioural change in relation to alcohol exposure in early pregnancy and impact on perinatal outcomes - a prospective cohort study

Alcohol intake Non-drinker Ex-drinker Current drinker Odds ratio i Odds ratio ii
Total 95% confidence 95% confidence
n= 6725 n= 708 (%) n= 5649 (%) n= 368 (%) intervals intervals
Maternal age      
< 20 years 27 (3.8) 161 (2.8) 10 (2.7) 0.99 (0.65-1.51) 0.99 (0.46-2.10)
20-29 years 312 (44.0) 1884 (33.3) 117 (31.8) 1.00 1.00
30-39 years 347 (49.0) 3362 (59.4) 214 (58.1) 1.60 (1.36-1.89)* 1.64 (1.25-1.76)*
> 40 years 22 (3.1) 252 (4.5) 27 (7.3) 1.90 (1.21-2.98)* 3.27 (1.79-5.97)*
Single Marital status 302 (42.7) 2211 (39.1) 179 (48.6) 0.83 (0.71-0.98)* 1.24 (0.97-1.61)
Socioeconomic group      
Professional 149 (21.0) 1823 (32.3) 101 (27.4) 2.69 (2.12-3.42)* 1.24 (0.86-1.78)
Home duties 159 (22.5) 723 (12.8) 87 (23.6) 1.00 1.00
Non-manual 241 (34.0) 2275 (40.2) 111 (30.2) 2.08 (1.67-2.58)* 0.84 (0.60-1.19)
Manual 35 (4.9) 219 (3.9) 13 (3.5) 1.38 (0.93-2.04) 0.68 (0.34-1.35)
Unemployed 78 (11.0) 384 (6.8) 41 (11.1) 1.08 (0.80-1.46) 0.96 (0.61-1.52)
Non-classifiable 46 (6.5) 229 (4.0) 15 (4.1) 1.09 (0.76-1.57) 0.60 (0.32-1.13)
Irish Nationality 472 (66.7) 4732 (83.6) 317 (86.1) 2.56 (2.15-3.04)* 3.05 (2.18-4.27)*
Private Health Care 48 (6.8) 1137 (20.1) 35 (9.5) 3.41 (2.52-4.60)* 1.42 (0.90-2.24)
Nulliparous 270 (38.1) 2548 (45.0) 126 (34.2) 1.31 (1.12-1.54)* 0.84 (0.64-1.09)
Unplanned pregnancy 268 (37.9) 1684 (29.8) 147 (39.9) 0.70 (0.60-0.83)* 1.10 (0.86-1.44)
Gestation at booking      
< 12 weeks 254 (35.9) 2299 (40.6) 118 (32.1) 1.00 1.00
12-20 weeks 400 (56.5) 3078 (54.4) 215 (58.4) 0.85 (0.72-1.00) 1.16 (0.88-1.52)
> 20 weeks 54 (7.6) 264 (4.7) 33 (9.0) 0.54 (0.39-0.74)* 1.32 (0.81-2.14)
Smoker 127 (17.9) 808 (14.3) 131 (35.6) 0.77 (0.62-0.95)* 2.58 (1.90-3.49)*
Illicit drug use (ever) 52 (7.3) 476 (8.4) 64 (17.4) 1.17 (0.86-1.57) 2.67 (1.80-3.95)*
Social worker referral 32 (4.5) 105 (1.9) 15 (4.1) 0.41 (0.27-0.61)* 0.88 (0.47-1.66)
  1. i Ex-drinkers versus Non-drinkers.
  2. ii Current drinkers versus Non-drinkers.
  3. Reference category.
  4. * p<0.05.