Distribution of small for gestational age and preterm birth by alcohol consumption during the pre-pregnancy and pregnancy periods (unadjusted analysis), Born in Bradford study 2007–2010
| Abstinent, n (%) | Low-moderate, n (%) | Binge (occasional), n (%) | Binge (frequent), n (%) | Missing data, n (%) | |
|---|---|---|---|---|---|
| Alcohol during the 3 months before pregnancy | |||||
| Total | 7672 | 516 | 1895 | 762 | 5 |
| Small for gestational age (≤10%) | 1178 (15.4) | 39 (7.6) | 137 (7.2) | 71 (9.3) | 0 (0) |
| Optimal birth weight (>10%) | 6494 (84.6) | 477 (92.4) | 1759 (92.8) | 691 (90.7) | 5 (100) |
| Gestational age <37 weeks (preterm) | 397 (5.2) | 32 (6.2) | 106 (5.6) | 50 (6.6) | 0 (0) |
| Gestational age ≥37 weeks | 7275 (94.8) | 483 (93.8) | 1790 (94.4) | 712 (93.4) | 5 (100) |
| Alcohol during the first trimester of pregnancy | |||||
| Total | 9183 | 667 | 737 | 236 | 28 |
| Small for gestational age (≤10%) | 1275 (13.9) | 54 (8.1) | 63 (8.5) | 29 (12.3) | 4 (14.3) |
| Optimal birth weight (>10%) | 7908 (86.1) | 613 (91.9) | 674 (91.4) | 207 (87.7) | 24 (85.7) |
| Gestational age <37 weeks (preterm) | 483 (5.3) | 47 (7) | 33 (4.5) | 19 (8) | 3 (10.7) |
| Gestational age ≥37 weeks | 8700 (94.7) | 620 (92.9) | 704 (95.5) | 217 (91.9) | 25 (89.3) |
| Alcohol during the second trimester of pregnancy | |||||
| Total | 9589 | 923 | 297 | 36 | 6 |
| Small for gestational age | 1320 (13.8) | 60 (6.5) | 36 (12.1) | 8 (22.2) | 1 (16.7) |
| Optimal birth weight | 8269 (86.2) | 863 (93.5) | 261 (87.9) | 28 (77.8) | 5 (83.3) |
| Gestational age <37 weeks (preterm) | 516 (5.4) | 52 (5.6) | 14 (4.7) | 3 (8.3) | 0 (0) |
| Gestational age ≥37 weeks | 9073 (94.6) | 871 (94.4) | 283 (95.3) | 33 (91.7) | 6 (100) |