Table 1.
Characteristics of women at recruitment by availability of delivery data and group allocation, proportions % (numbers)
| Delivery data (n=2258) |
No delivery data (n=2068) |
|||
|---|---|---|---|---|
| Characteristics | Selective iron (1149) % (n) | Routine iron (1109) % (n) | Selective iron (993) % (n) | Routine iron (1075) % (n) |
| Maternal age, mean (SD) years | 24.6 (5.4) | 24.7 (5.3) | 25.0 (5.6) | 24.6 (5.6) |
| Maternal age (years) (categorised) | ||||
| <20 | 17.5 (201) | 16.5 (183) | 15.7 (156) | 19.3 (207) |
| 20–24 | 41.1 (472) | 39.9 (443) | 39.0 (387) | 37.1 (399) |
| 25–29 | 23.1 (265) | 23.3 (258) | 23.9 (237) | 23.4 (252) |
| 30–34 | 11.3 (130) | 13.8 (153) | 12.9 (128) | 13.3 (143) |
| ≥35 | 6.3 (72) | 5.6 (62) | 7.4 (74) | 6.5 (70) |
| Missing | 0.8 (9) | 0.9 (10) | 1.1 (11) | 0.4 (4) |
| Haemoglobin by HemoCue (g/dl), mean (SD) | 9.6 (1.7) | 9.6 (1.7) | ||
| Haemoglobin by HemoCue (g/dl), n (%) | ||||
| <7.0 | 6.9 (79) | 6.2 (62) | ||
| 7.0–8.90 | 24.6 (283) | 25.4 (252) | ||
| 9.0–9.90 | 23.5 (270) | 24.4 (242) | ||
| 10.0–10.90 | 21.9 (252) | 21.1 (210) | ||
| 11.0–11.90 | 14.1 (162) | 13.7 (136) | ||
| ≥ 12.0 | 7.9 (91) | 8.4 (83) | ||
| Not measured | 1.0 (12) | 0.8 (8) | ||
| Previous abortions | ||||
| No | 87.6 (1007) | 86.8 (963) | 86.0 (854) | 85.4 (918) |
| Yes | 12.1 (139) | 12.8 (142) | 13.6 (135) | 14.5 (156) |
| Missing | 0.3 (3) | 0.4 (4) | 0.4 (4) | 0.1 (1) |
| Gestational age, mean (SD) weeks | 21.6 (5.9) | 21.7 (5.6) | 21.0 (5.9) | 21.3 (5.8) |
| Gestational age (categorised) | ||||
| <16 | 19.2 (221) | 16.4 (182) | 21.5 (213) | 20.1 (216) |
| 17–20 | 21.8 (250) | 24.2 (268) | 22.5 (223) | 21.7 (233) |
| 21–26 | 34.3 (394) | 32.6 (361) | 31.3 (311) | 33.7 (362) |
| >27 | 19.7 (226) | 19.7 (219) | 17.5 (174) | 18.2 (196) |
| No information | 58 (5.0) | 7.1 (79) | 7.3 (72) | 6.3 (68) |
| Previous stillbirths | ||||
| No | 91.5 (1052) | 92.3 (1024) | 91.6 (910) | 91.0 (978) |
| Yes | 8.2 (94) | 7.2 (80) | 7.9 (78) | 8.9 (96) |
| Missing | 0.3 (3) | 0.5 (5) | 0.5 (5) | 0.1 (1) |
| Previous deliveries | ||||
| None | 29.7 (341) | 30.3 (336) | 29.2 (290) | 33.8 (363) |
| One | 31.9 (367) | 31.7 (352) | 30.6 (304) | 28.5 (306) |
| Two | 19.2 (221) | 17.8 (197) | 17.9 (178) | 18.6 (200) |
| Three or more | 18.8 (216) | 19.8 (220) | 22.0 (218) | 19.0 (205) |
| Missing | 0.4 (4) | 0.4 (4) | 0.3 (3) | 0.1 (1) |
| HIV status | ||||
| Negative | 81.2 (934) | 81.8 (907) | 76.7 (762) | 79.0 (849) |
| Positive | 18.8 (215) | 18.2 (202) | 23.3 (231) | 21.0 (226) |
| Twin pregnancy | ||||
| No | 98.7 (1134) | 98.6 (1093) | 99.2 (985) | 99.2 (1066) |
| Yes | 1.3 (15) | 1.4 (16) | 0.8 (8) | 0.8 (9) |
| Symptoms during current pregnancy before first prenatal visit | ||||
| Fever | ||||
| Yes | 22.9 (264) | 24.4 (271) | 28.8 (286) | 23.8 (256) |
| Headache | ||||
| Yes | 41.5 (477) | 43.5 (482) | 44.3 (440) | 43.0 (462) |
| Cold/chills | ||||
| Yes | 18.0 (207) | 18.4 (204) | 20.6 (205) | 18.8 (202) |
| Vomit/nausea | ||||
| Yes | 27.5 (316) | 26.9 (298) | 29.8 (296) | 28.6 (307) |
| Body aches | ||||
| Yes | 21.8 (251) | 21.3 (237) | 23.8 (236) | 23.3 (251) |
| Self-reported malaria | ||||
| Yes | 5.7 (66) | 6.0 (67) | 5.9 (59) | 6.3 (68) |
| Had malaria test | ||||
| Yes | 7.0 (80) | 7.1 (79) | 8.0 (79) | 7.9 (85) |