Table 1.
Maternal and infant demographic characteristics for the whole sample and by infant sex
| Whole sample (N = 39) | Males (n = 20) | Females (n = 19) | Sex difference statistic (p value) | |
|---|---|---|---|---|
| Infant demographics | ||||
| Age at MRI (months); mean (SD) | 4.83 (1.15) | 4.73 (1.20) | 4.94 (1.11) | t = −0.563, p = 0.577 |
| Gestational age at birth (weeks); mean (SD) | 39.71 (1.95) | 39.85 (1.83) | 39.57 (2.11) | t = −0.445, p = 0.659 |
| Birth weight (g); mean (SD) | 3390.51 (527.48) | 3490.50 (424.05) | 3285.26 (612.19) | t = −1.22, p = 0.229 |
| Weight at MRI (g); mean (SD) | 7105.30 (1302.95) | 7262.51 (1172.48) | 6939.81 (1440.83) | t = −0.77, p = 0.450 |
| Maternal demographics | ||||
| Age (years); mean (SD) | 33.82 (4.45) | 33.90 (4.48) | 33.74 (4.53) | t = −1.13, p = 0.911 |
| Ethnicity; n (%) | χ 2 = 4.47, p = 0.214 | |||
| White | 32 (82.1) | 18 (90.0) | 14 (73.7) | |
| Asian | 4 (10.3) | 1 (5.0) | 3 (15.8) | |
| Black | 1 (2.6) | 1 (5.0) | 0 (0.0) | |
| Mixed race | 2 (5.1) | 0 (0.0) | 2 (10.5) | |
| Educational level; n (%) | χ2 = 1.25, p = 0.536 | |||
| GCSE and A-levels | 2 (5.1) | 1 (5.0) | 1 (5.3) | |
| Vocational college | 4 (10.3) | 1 (5.0) | 3 (15.8) | |
| Higher education | 33 (84.6) | 18 (90.0) | 15 (78.9) |
SD standard deviation, GCSE General Certificate of Secondary Education, A-Levels General Certificate of Education Advanced Level, Higher education undergraduate and postgraduate degree