Table 2 Study sample characteristics
From: Low-level prenatal lead exposure and infant sensory function
| Â | Infants with Newborn ABR Data | Infants with 6-Wk Grating VA Data | ||
|---|---|---|---|---|
Variable | N | Median (5th, 95th percentile) | N | Median (5th, 95th percentile) |
Gestational age (wks) at mid-pregnancy visit | 353 | 15.0 (13.0, 19.0) | 1054 | 15.0 (13.0, 19.0) |
Gestational age (wks) at late-pregnancy visit | 352 | 39.0 (37.0, 41.0) | 1054 | 39.4 (36.9, 41.3) |
Gestational age (wks) at birth | 353 | 39.0 (37.0, 41.0) | 1058 | 39.7 (37.9, 41.4) |
Birth weight (g) | 361 | 3400 (2850, 4100) | 1054 | 3400 (2750, 4000) |
Head circ. (cm) | 361 | 34.1 (31.9, 36.0) | 1030 | 34.1 (32.0, 36.0) |
Age at testing (days) | 362 | 2.2 (1, 4) | 1058 | 43 (41, 89) |
| Â | Â | N (%) | Â | N (%) |
Sex (male) | 350 | 183 (52.3) | 1053 | 555 (52.5) |
Low cord ferritin | 360 | 99 (27.5) | 1055 | 298 (28.3) |