Table 2.
Descriptive statistics for outcomes.
| Fetal characteristics trimester 2 | Mean (SD in brackets) | Mean gestational age (SD in brackets) |
|---|---|---|
| Bi-parietal diameter (mm) (14,172 scans) | 47.6 (9.3) | 19.5 (2.8) |
| Femur length (mm) (15,417 scans) |
33.0 (7.6) | 19.6 (2.7) |
| Abdominal circumference (mm) (12,606 scans) | 165.9 (31.3) | 20.5 (2.8) |
| Fetal characteristics trimester 3 | ||
| Bi-parietal diameter (mm) (5728 scans) |
84.6 (7.0) | 33.3 (3.1) |
| Femur length (mm) (6258 scans) |
64.7 (6.5) | 33.5 (3.2) |
| Abdominal circumference (mm) (9171 scans) | 296.4(35.0) | 33.4 (3.2) |
| Birth characteristics (pregnancies in brackets) | ||
| Crown heel length (cm) (13,667 pregnancies) |
49.5 (3.0) | 39.0 (2.3) |
| Occipitofrontal circumference (cm) (13,714 pregnancies) | 34.5 (1.9) | 39.0 (2.3) |
| Birthweight (kg) (13,756 pregnancies) |
3339.8 (630.5) | 39.0 (2.3) |