Table 1 Characteristics of fetal and maternal characteristics, separated by sex of fetus
Females | Males | All | |
|---|---|---|---|
Fetal characteristics | |||
Mean ± SD (n) | |||
1st Trimester scan | |||
GA at time of scan* | 12.6 ± 0.7 (104) | 12.6 ± 0.8 (94) | 12.7 ± 0.7 (198) |
Fetal biometric measures | |||
HC | 79.9 ± 10 (88) | 82.2 ± 10.9 (82) | 81.0 ± 10.5 (170) |
2nd Trimester Scan | |||
GA at time of scan | 20.2 ± 0.5 (108) | 20.4 ± 0.4 (95) | 20.3 ± 0.4 (203) |
EFW (g)† | 345.0 ± 33.4 (90) | 356.5 ± 38.2 (86) | 350.6 ± 36.2 (176) |
Fetal biometric measures | |||
HC | 174.5 ± 8.0 (112) | 179.0 ± 6.5 (95) | 176.5 ± 7.7 (207) |
TCD | 20.4 ± 0.9 (105) | 20.7 ± 0.8 (94) | 20.6 ± 0.8 (199) |
VA | 6.7 ± 1.0 (102) | 6.8 ± 0.9 (94) | 6.7 ± 0.9 (196) |
Research scan | |||
GA at time of scan | 28.0 ± 1.2 (115) | 28.0 ± 1.3 (104) | 28.0 ± 1.3 (219) |
EFW (g)† | 1196.1 ± 228.3 (112) | 1238.6 ± 232.4 (103) | 1216.5 ± 230.7 (215) |
Fetal biometric measures | |||
HC | 262.6 ± 14.4 (111) | 266.3 ± 14.0 (103) | 264.4 ± 14.3 (214) |
TCD | 33.1 ± 2.6 (114) | 33.3 ± 2.5 (103) | 33.2 ± 2.5 (217) |
VA | 4.9 ± 1.4 (107) | 5.4 ± 1.5 (88) | 5.1 ± 1.5 (195) |
MCA | 2.1 ± 0.3 (112) | 2.1 ± 0.3 (103) | 2.1 ± 0.3 (215) |
Birth information‡ | |||
Birth weight (g) | 3382.0 ± 540.4 (99) | 3460.9 ± 481.7 (92) | 3420.0 ± 513.16 (191) |
Gestation at birth (weeks) | 39.6 ± 1.6 (99) | 39.6 ± 1.5 (92) | 39.6 ± 1.56 (191) |
Maternal characteristics | |||
N (%**) | |||
Maternal ethnicity | |||
White | 94 (81.7) | 82 (78.8) | 176 (80.4) |
Black | 1 (0.9) | 2 (1.9) | 3 (1.4) |
East Asian | 2 (1.7) | 4 (3.8) | 6 (2.7) |
South Asian | 2 (1.7) | 3 (2.9) | 5 (2.3) |
Not disclosed | 16 (13.9) | 13 (12.5) | 29 (13.2) |
Mean (SD) | |||
Maternal age | 32.2 (4.3) | 32.7 (4.8) | 32.4 (4.5) |