Table 7 Uncertainty of gestational age assessment, expressed as the distance between the 5th and 95th centile, when using outer-outer biparietal diameter (BPDoo), head circumference (HC) and femur length (FL) based on the present study, the study of Altman and Chitty [10] and that of Johnsen et al. [14]
From: Fetal age assessment based on 2nd trimester ultrasound in Africa and the effect of ethnicity
Present study | Altman and Chitty | Johnsen et al | |||||
|---|---|---|---|---|---|---|---|
Measurement | 50th centile | Uncertainty | 50th centile | Uncertainty | 50th centile | Uncertainty | |
(mm) | (weeks + days) | (± days) | (weeks + days) | (± days) | (weeks + days) | (± days) | |
BPDoo | 22 | 12 + 3 | 6 | 12 + 4 | 7 | 12 + 3 | 6 |
50 | 20 + 2 | 5 | 20 + 3 | 13 | 20 + 2 | 9 | |
HC | 90 | 13 + 6 | 6 | 13 + 2 | 5 | 13 + 3 | 6 |
180 | 21 + 0 | 6 | 20 + 5 | 10 | 20 + 4 | 8 | |
FL | 14 | 14 + 1 | 7 | 14 + 1 | 7 | 14 + 3 | 6 |
32 | 20 + 2 | 8 | 20 + 0 | 11 | 20 + 2 | 8 | |