Characteristics of women by randomisation status who contributed to the health utilisation study
| Vitamin (n=54) | Placebo (n=45) | Comparison (99% CI) | |
| Mean (SD) gestational age at recruitment (weeks) | 17.8 (2.5) | 18.7 (2.3) | −0.93 (−2.19 to 0.34) |
| Mean (SD) BMI (kg/m2) | 26.75 (7.24) | 27.41 (5.76) | −0.66 (−4.10 to 2.78) |
| Ethnicity (non-white) | 39% | 33% | 1.27 (0.44 to 3.70) |
| Primiparous | 48% | 38% | 1.53 (0.54 to 4.34) |
| Multiple pregnancy (twins) | 20% | 18% | 1.18 (0.33 to 4.23) |
| Maternal age (years) | 32.7 (5.0) | 33.34 (4.7) | −0.6 (−3.18 to 1.95) |
| College/university education | 61% | 56% | 1.26 (0.44 to 3.57) |
| Smoking status | |||
| Never | 33 (61%) | 25 (56%) | Reference |
| Current smoker | 3 (6%) | 4 (9%) | 0.57 (0.07 to 4.56) |
| Stopped before present pregnancy | 15 (28%) | 11 (24%) | 1.03 (0.30 to 3.53) |
| Stopped during pregnancy | 3 (6%) | 5 (11%) | 0.45 (0.06 to 3.36) |
| Compliance with trial medication (took at least 80%) | 41 (76%) | 31 (71%) | 1.32 (0.42 to 4.20) |
Data shown are mean (SD) or percentages as appropriate.
Comparisons are differences in means or ORs as appropriate with 99% CIs.
BMI, body mass index.