Birth outcomes by trial group and by the data collection method, numbers (proportions %) or means (SDs SD)
| Original+traced birth data (n=3301) | Original birth data (n=2258) | Traced birth data (n=1043) | |||||
|---|---|---|---|---|---|---|---|
| Birth outcomes | Selective iron (n=1642) | Routine iron (n=1659) | p Value | Selective iron (n=1149) | Routine iron (n=1109) | Selective iron (n=493) | Routine iron (n=550) |
| (% of recruited) | (76.7) | (76.0) | (53.6) | (50.8) | (23.0) | (25.2) | |
| Duration of gestation*, n (%) | |||||||
| <37 weeks | 445 (27.1) | 419 (25.3) | 304 (26.5) | 274 (24.7) | 141 (28.6) | 145 (26.4) | |
| ≥37 weeks | 1197 (72.9) | 1240 (74.7) | 0.193 | 845 (73.5) | 835 (75.3) | 352 (71.4) | 405 (73.6) |
| Duration of gestation*, mean (SD) weeks | 38.9 (5.7) | 39.1 (5.8) | 0.302 | 38.4 (4.5) | 38.5 (4.3) | 40.1 (7.7) | 40.3 (7.9) |
| Birth weight (g), n (%) grams | 0.072 | ||||||
| <2500 | 181 (11.0) | 189 (11.7) | 134 (11.7) | 142 (12.8) | 47 (9.5) | 47 (8.5) | |
| 2500–2999 | 421 (25.6) | 416 (25.0) | 351 (30.5) | 345 (31.1) | 70 (14.2) | 71 (12.9) | |
| 3000–3499 | 552 (33.6) | 513 (30.9) | 465 (40.5) | 419 (37.8) | 87 (17.6) | 94 (17.1) | |
| 3500–3999 | 183 (11.1) | 198 (11.9) | 146 (12.7) | 153 (13.8) | 37 (7.5) | 45 (8.2) | |
| ≥4000 | 45 (2.7) | 29 (1.7) | 34 (3.0) | 23 (2.1) | 10 (82.0) | 6 (1.1) | |
| No information | 260 (15.8) | 314 (18.8) | 19 (1.7) | 27 (2.4) | 242 (49.1) | 287 (52.2) | |
| Birth weight, mean (SD) grams | 2993.1 (514.2) | 2977.6 (534.3) | 0.462 | 3001.3 (494.7) | 2989.4 (514.9) | 2952.6 (591.1) | 2929.2 (606.1) |
| Mode of delivery, n (%) | 0.775 | ||||||
| Normal | 1115 (67.9) | 1130 (68.1) | 1007 (87.6) | 991 (89.4) | 108 (21.9) | 139 (25.3) | |
| Caesarean section | 66 (4.0) | 74 (4.5) | 15 (1.3) | 22 (2.0) | 51 (10.3) | 52 (9.5) | |
| No information | 461 (28.1) | 455 (27.4) | 127 (11.1) | 96 (8.7) | 334 (67.7) | 359 (65.3) | |
| Perinatal deaths†, n (%) | 39 (2.4) | 40 (2.4) | 0.946 | 35 (3.0) | 37 (3.3) | 4 (0.8) | 3 (0.5) |
*Calculated using dates of conception and birth (or admission if date of birth is missing); see Methods.
†As available in birth records, a likely underestimation.