Table 1.
Data descriptives
| Variables | All subjects (n = 68), mean (SD) | Boys (n = 31), mean (SD) | Girls (n = 37), mean (SD) | F | p |
|---|---|---|---|---|---|
| Infant age at scan (from estimated due date) (d) | 25.6 (8.1) | 23.9 (7.6) | 27.0 (8.3) | 0.826 | 0.12 |
| Infant age at scan (from birth date) (d) | 25.5 (7.2) | 25.3 (7.8) | 25.2 (6.8) | 2.33 | 0.928 |
| Birthweight (g) | 3564 (429) | 3603 (403) | 3531 (454) | 0.526 | 0.494 |
| Birth length (cm) | 50.3 (1.7) | 50.6 (1.7) | 50.1 (1.7) | 0.448 | 0.287 |
| Head circumference (cm) | 35.2 (1.3) | 35.5 (1.2) | 35 (1.3) | 0.555 | 0.169 |
| Duration of labor (min) | 514 (293) | 506 (291) | 523 (299) | 0.014 | 0.819 |
| Maternal prepregnancy BMI (kg/m2) | 24.3 (3.9) | 23.4 (3.4) | 25 (4.1) | 1.267 | 0.095 |
| Maternal age at term (y) | 30.2 (4.5) | 30.9 (4.3) | 29.6 (4.6) | 0.005 | 0.251 |
| Paternal age at term (y) | 31.6 (4.4) | 30.8 (3.6) | 32.2 (4.8) | 1.423 | 0.279 |
| Maternal educationa | Number (%) | Number (%) | Number (%) | 1.454b | 0.483 |
| (1) Elementary school | 1 (1.5) | 1 (3.2) | 0 (0) | ||
| (2) High school/career college | 41 (62.1) | 20 (64.5) | 21 (60) | ||
| (3) College/university | 24 (36.4) | 10 (32.3) | 14 (40) | ||
| Maternal smoking 1st trimester | 7 (10.3) | 3 (9.7) | 4 (10.8) | 0.023b | 0.878 |
| Maternal smoking 3rd trimester | 3 (4.4) | 1 (3.3) | 2 (6.1) | 0.258b | 0.612 |
| Maternal medication 1st trimester | 5 (7.4) | 4 (12.9) | 1 (2.7) | 2.576b | 0.108 |
| Maternal medication 3rd trimester | 3 (4.4) | 3 (10.3) | 0 (0) | 3.693b | 0.055 |
Results of independent samples t tests: no significant differences between the sexes within the variables listed below
aMaternal medication = medication against depression/anxiety during pregnancy
bNote small subsample sizes