Table 1 Demographic data for subjects for the current study (n = 358). Distributions summarized as the mean [min–max] or n (%)
|  | Overall (n = 358) | Females (n = 168) | Males (n = 190) |
|---|---|---|---|
Maternal age (years) | 29 [14–44] | 28 [15–44] | 29 [14–44] |
Maternal education | |||
  < 12 years | 49 (13.7) | 19 (11.3) | 30 (15.8) |
 12 to 16 years | 165 (46.1) | 82 (48.8) | 83 (43.7) |
 16 + years | 134 (37.4) | 64 (38.1) | 70 (36.8) |
 Missing | 10 (2.8) | 3 (1.8) | 7 (3.7) |
Smoking during pregnancy | |||
 No | 314 (87.7) | 146 (86.9) | 168 (88.4) |
 Yes | 38 (10.6) | 20 (11.9) | 18 (9.5) |
 Missing | 6 (1.7) | 2 (1.2) | 4 (2.1) |
Gestational age (weeks) | 26 [23–27] | 26 [23–27] | 26 [23–27] |
Birth weight (g) | 828 [420–1420] | 811 [430–1360] | 843 [420–1420] |