Variable | n | Meana | Range |
---|---|---|---|
Subject characteristics | Â | Â | Â |
   Mother's age (years) | 289 | 30.0 ± 5.5 | 18.0–43.0 |
   Race/ethnicity of mother and biological father |  |  |  |
Both Caucasian | Â | 147 (58.33%) | Â |
Both African-American | Â | 20 (7.94%) | Â |
Both Asian | Â | 39 (15.48%) | Â |
Both Hispanic | Â | 15 (5.95%) | Â |
Mixed | Â | 31 (12.30%) | Â |
No data | Â | 37 | Â |
   Parity |  |  |  |
First | Â | 118 (43.54%) | Â |
Second | Â | 77 (28.41%) | Â |
Third | Â | 46 (16.97%) | Â |
Fourth and above | Â | 30 (11.07%) | Â |
No data | 18 | Â | Â |
   Prepregnancy weight (kg) | 199 | 62.7 ± 12.3 | 38.3–112.5 |
   Gestation duration (weeks) | 289 | 39.6 ± 1.2 | 36.5–44.0 |
   Gender of the baby |  |  |  |
Male | Â | 134 (50.57%) | Â |
Female | Â | 131 (49.43%) | Â |
No data | 24 | Â | Â |
   Birth weight (g) | 288 | 3,402.4 ± 431.9 | 2,256–4,660 |
   Cord blood volume (ml) | 289 | 92.5 ± 24.6 | 44.5–201.5 |
Cord blood plasma hormone levels | Â | Â | Â |
   Estradiol (ng/dl) | 289 | 930.9 ± 528.6 | 40.6–3,305.4 |
   Unconjugated estriol (ng/ml) | 289 | 331.0 ± 141.4 | 18.1–1,459.5 |
   Testosterone (ng/ml) | 289 | 1.7 ± 0.9 | 0.3–9.2 |
   Sex hormone-binding globulin (nmol/l) | 289 | 22.8 ± 8.0 | 6.7–55.0 |
   Progesterone (ng/ml) | 289 | 226.6 ± 134.4 | 26.5–841.0 |
   Prolactin (ng/ml) | 289 | 254.0 ± 103.6 | 47.4–686.0 |
   Insulin-like growth factor-1 (ng/ml) | 289 | 81.2 ± 52.5 | 10.2–306.7 |
   Insulin-like growth factor binding protein-3 (ng/ml) | 289 | 941.1 ± 309.9 | 300.0–2,534.0 |
Cord blood cell populations | Â | Â | Â |
   Initial total nucleated cells × 106/ml | 288b | 16.1 ± 5.2 | 6.3–40.6 |
   Initial mononuclear cells × 106/ml | 288b | 7.6 ± 2.8 | 2.8–20.8 |
   CD34+ cells/103 mononuclear cells | 289 | 8.9 ± 5.5 | 0.4–35.5 |
   CD34+CD38- cells/103 mononuclear cells | 289 | 4.1 ± 2.7 | 0.0–14.4 |
   CD34+c-kit + cells/103 mononuclear cellsc | 249 | 7.6 ± 4.9 | 0.2–34.4 |
   Granulocyte–macrophage colony-forming units/103 mononuclear cellsd | 175 | 5.4 ± 3.2 | 0.5–19.7 |