Table 1.
Characteristics of 13,577 children enrolled in the PROBIT trial with outcome data at 16 years
| N (%) | |||
|---|---|---|---|
| Characteristic | Total (n = 13557) | Intervention (n = 7064) | Control (n = 6493) |
| Measured at child’s birth | |||
| Maternal age, y | |||
| <20 | 1820 (13.4) | 979 (13.9) | 841 (13.0) |
| 20–34 | 11173 (82.4) | 5792 (82.0) | 5381 (82.9) |
| ≥35 | 564 (4.2) | 293 (4.1) | 271 (4.2) |
| Maternal education | |||
| Completed university | 1842 (13.6) | 1002 (14.2) | 840 (12.9) |
| Advanced secondary or partial university | 6925 (51.1) | 3365 (47.6) | 3560 (54.8) |
| Common secondary | 4318 (31.9) | 2406 (34.1) | 1912 (29.4) |
| Incomplete secondary | 472 (3.5) | 291 (4.1) | 181 (2.8) |
| Paternal education | |||
| Completed university | 1737 (12.8) | 936 (13.3) | 801 (12.3) |
| Advanced secondary or partial university | 6205 (45.8) | 2910 (41.2) | 3295 (50.7) |
| Common secondary | 4883 (36.0) | 2828 (40.0) | 2055 (31.6) |
| Incomplete secondary or unknown | 732 (5.4) | 390 (5.5) | 342 (5.3) |
| Stratum-level variable | |||
| East/Urban | 4150 (30.6) | 2215 (31.4) | 1935 (29.8) |
| East/Rural | 2152 (15.9) | 1075 (15.2) | 1077 (16.6) |
| West/Urban | 3524 (26.0) | 2296 (32.5) | 1228 (18.9) |
| West/Rural | 3731 (27.5) | 1478 (20.9) | 2253 (34.7) |
| Number children in household | |||
| 0 | 7707 (56.8) | 4152 (58.8) | 3555 (54.8) |
| 1 | 4717 (34.8) | 2365 (33.5) | 2352 (36.2) |
| 2+ | 1133 (8.4) | 547 (7.7) | 586 (9.0) |
| Maternal smoking during pregnancy | |||
| No | 13287 (98.0) | 6898 (97.7) | 6389 (98.4) |
| Yes | 270 (2.0) | 166 (2.3) | 104 (1.6) |
| Child sex | |||
| Female | 6576 (48.5) | 3474 (49.2) | 3102 (47.8) |
| Male | 6981 (51.5) | 3590 (50.8) | 3391 (52.2) |
| Birthweight, mean (SD), kg | 3.44 (0.42) | 3.44 (0.42) | 3.44 (0.42) |
| Gestation length, mean (SD), wks | 39.4 (1.0) | 39.4 (1.0) | 39.3 (1.0) |
| Measured in child’s first year | |||
| Duration of exclusive breastfeeding, mo | |||
| <3 | 9861 (73.2) | 3821 (54.7) | 6040 (93.1) |
| 3–<6 | 3126 (23.2) | 2727 (39.0) | 399 (6.2) |
| ≥6 | 484 (3.6) | 437 (6.3) | 47 (0.7) |
| Duration of any breastfeeding, mo | |||
| <3 | 4692 (34.8) | 2085 (29.8) | 2607 (40.2) |
| 3–<6 | 3105 (23.0) | 1590 (22.7) | 1515 (23.4) |
| ≥6 | 5676 (42.1) | 3315 (47.4) | 2361 (36.4) |
SD = standard deviation