Table 3 Crown-rump length (CRL) measurements in relation to gestational age for the original equation fit reported by Verburg compared to model fit of the simulated data (Approach 2)
Verburg’s original equation | Approach 2 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Estimated GA (weeks) | Estimated GA (weeks) | Difference (days) | |||||||
CRL (mm) | 3rdcentile | Median | 97thcentile | 3rdcentile | Median | 97thcentiles | 3rdcentile | Median | 97thcentile |
10 | 6.88 | 7.50 | 8.18 | 7.08 | 7.71 | 8.39 | -1.41 | -1.45 | -1.48 |
15 | 7.63 | 8.31 | 9.06 | 7.70 | 8.38 | 9.12 | -0.52 | -0.47 | -0.41 |
20 | 8.22 | 8.96 | 9.77 | 8.25 | 8.98 | 9.77 | -0.21 | -0.12 | -0.02 |
25 | 8.73 | 9.52 | 10.38 | 8.75 | 9.52 | 10.36 | -0.11 | 0.00 | 0.12 |
30 | 9.19 | 10.02 | 10.92 | 9.20 | 10.01 | 10.90 | -0.09 | 0.02 | 0.15 |
35 | 9.60 | 10.47 | 11.41 | 9.62 | 10.47 | 11.39 | -0.11 | 0.01 | 0.14 |
40 | 9.99 | 10.89 | 11.87 | 10.01 | 10.89 | 11.86 | -0.13 | -0.01 | 0.13 |
45 | 10.36 | 11.29 | 12.31 | 10.38 | 11.29 | 12.29 | -0.14 | -0.02 | 0.12 |
50 | 10.70 | 11.67 | 12.72 | 10.72 | 11.67 | 12.70 | -0.13 | 0.00 | 0.15 |
55 | 11.04 | 12.03 | 13.12 | 11.05 | 12.03 | 13.09 | -0.09 | 0.04 | 0.20 |
60 | 11.36 | 12.39 | 13.50 | 11.37 | 12.37 | 13.46 | -0.03 | 0.11 | 0.28 |
65 | 11.67 | 12.73 | 13.87 | 11.67 | 12.70 | 13.82 | 0.06 | 0.21 | 0.39 |
70 | 11.98 | 13.06 | 14.24 | 11.96 | 13.01 | 14.16 | 0.18 | 0.35 | 0.54 |
75 | 12.28 | 13.39 | 14.59 | 12.23 | 13.31 | 14.49 | 0.33 | 0.51 | 0.73 |
80 | 12.57 | 13.71 | 14.94 | 12.50 | 13.60 | 14.81 | 0.50 | 0.71 | 0.95 |
85 | 12.86 | 14.02 | 15.28 | 12.76 | 13.89 | 15.11 | 0.71 | 0.94 | 1.20 |
90 | 13.15 | 14.33 | 15.62 | 13.01 | 14.16 | 15.41 | 0.95 | 1.20 | 1.49 |
95 | 13.43 | 14.64 | 15.96 | 13.25 | 14.42 | 15.70 | 1.22 | 1.50 | 1.81 |
100 | 13.71 | 14.94 | 16.29 | 13.49 | 14.68 | 15.98 | 1.51 | 1.82 | 2.17 |