Characteristic | n (%) | Control (n = 233) | Intervention (n = 245) |
---|---|---|---|
Median (25th, 75th percentile) or n (%) | Median (25th, 75th percentile) or n (%) | ||
Maternal blood lead concentration in late pregnancy ug/dL | 375 (78) | 1.5 (1.2, 1.8) | 1.4 (1.2, 1.9) |
Missing, n (%) | 103 (22) | 61 (26) | 42 (17) |
Type of birth | |||
Cesarean | 174 (36) | 86 (37) | 88 (36) |
Vaginal | 285 (60) | 134 (57) | 151 (62) |
Missing, n (%) | 19 (4) | 13 (6) | 6 (2) |
Preterm birth | |||
Preterm (< 37 weeks) | 31 (7) | 10 (4) | 21 (9) |
Full tern (≥ 37 weeks) | 428 (89) | 210 (90) | 218 (88) |
Missing, n (%) | 19 (4) | 13 (6) | 6 (3) |
Birth weight, grams | 458 (96) | 3450 (3125, 3800) | 3550 (3200, 3800) |
Missing, n (%) | 19 (4) | 13 (6) | 6 (2) |
Child’s sex | |||
Female | 220 (46) | 110 (47) | 110 (45) |
Male | 239 (50) | 111 (48) | 128 (52) |
Missing, n (%) | 19 (4) | 13 (5) | 6 (3) |
Child’s blood lead concentration at age 2, ug/dL | 328 (69) | 2.6 (1.9, 3.6) | 2.5 (1.7, 3.5) |
Missing, n (%) | 150 (31) | 80 (46) | 70 (45) |
Maternal depression level (BDI) at 2-year visit | |||
Mild | 369 (77) | 168 (72) | 201 (82) |
Moderate to severe | 31 (6) | 8 (4) | 13 (5) |
Missing, n (%) | 88 (18) | 57 (24) | 31 (13) |
Maternal WASI matrix reasoning raw score | 387 (81) | 16 (12, 19) | 17 (13, 19) |
Missing, n (%) | 91 (19) | 58 (25) | 33 (13) |
Maternal WASI vocabulary raw score | 387 (81) | 36 (32, 40) | 36 (32, 40) |
Missing, n (%) | 91 (19) | 58 (25) | 33 (13) |