Table I.
Sample demographics
| MZ twins | DZ twins | Single twin | Total | |
|---|---|---|---|---|
| Gender | ||||
| Male [N (%)] | 36 (43.90) | 54 (54.00) | 16 (45.71) | 106 |
| Female [N (%)] | 46 (56.10) | 46 (46.00) | 19 (54.29) | 111 |
| Ethnicity | ||||
| Caucasian [N (%)] | 56 (68.29) | 74 (74.00) | 26 (74.29) | 156 |
| African‐American [N (%)] | 22 (26.83) | 24 (24.00) | 8 (22.86) | 54 |
| Other [N (%)] | 4 (4.88) | 2 (2.00) | 1 (2.86) | 7 |
| Gestational age at birth (days*); mean (SD) | 246.05 (18.95) | 249.56 (15.42) | 244.69 (1942) | 247.45 (17.52) |
| Gestational age at MRI (days*); mean (SD) | 288.00 (15.41) | 288.98 (16.90) | 291.29 (24.20) | 288.98 (17.70) |
| Birth weight (g); mean (SD) | 2,292.52 (539.98) | 2,404.27(486.65) | 2,292.57 (593.13) | 2,344.03 (525.73) |
*[Correction made here after initial online publication.]