Verburg’s original equation | Approach 1 | ||||||||
---|---|---|---|---|---|---|---|---|---|
Estimated GA (weeks) | Estimated GA (weeks) | Difference (days) | |||||||
CRL (mm) | 3rdcentile | Median | 97thcentile | 3rdcentile | Median | 97thcentile | 3rdcentile | Median | 97thcentile |
10 | 6.88 | 7.50 | 8.18 | 6.85 | 8.18 | 8.22 | 0.21 | -4.76 | -0.28 |
15 | 7.63 | 8.31 | 9.06 | 7.60 | 8.53 | 9.09 | 0.21 | -1.54 | -0.21 |
20 | 8.22 | 8.96 | 9.77 | 8.20 | 9.02 | 9.80 | 0.14 | -0.42 | -0.21 |
25 | 8.73 | 9.52 | 10.38 | 8.72 | 9.51 | 10.40 | 0.07 | 0.07 | -0.14 |
30 | 9.19 | 10.02 | 10.92 | 9.18 | 9.99 | 10.93 | 0.07 | 0.21 | -0.07 |
35 | 9.60 | 10.47 | 11.41 | 9.60 | 10.45 | 11.41 | 0.00 | 0.14 | 0.00 |
40 | 9.99 | 10.89 | 11.87 | 10.00 | 10.88 | 11.86 | -0.07 | 0.07 | 0.07 |
45 | 10.36 | 11.29 | 12.31 | 10.37 | 11.30 | 12.29 | -0.07 | -0.07 | 0.14 |
50 | 10.70 | 11.67 | 12.72 | 10.73 | 11.69 | 12.69 | -0.21 | -0.14 | 0.21 |
55 | 11.04 | 12.03 | 13.12 | 11.08 | 12.07 | 13.07 | -0.28 | -0.28 | 0.35 |
60 | 11.36 | 12.39 | 13.50 | 11.41 | 12.43 | 13.44 | -0.35 | -0.28 | 0.42 |
65 | 11.67 | 12.73 | 13.87 | 11.74 | 12.77 | 13.80 | -0.49 | -0.28 | 0.49 |
70 | 11.98 | 13.06 | 14.24 | 12.05 | 13.11 | 14.15 | -0.49 | -0.35 | 0.63 |
75 | 12.28 | 13.39 | 14.59 | 12.37 | 13.43 | 14.49 | -0.63 | -0.28 | 0.70 |
80 | 12.57 | 13.71 | 14.94 | 12.67 | 13.74 | 14.82 | -0.70 | -0.21 | 0.84 |
85 | 12.86 | 14.02 | 15.28 | 12.98 | 14.04 | 15.15 | -0.84 | -0.14 | 0.91 |
90 | 13.15 | 14.33 | 15.62 | 13.27 | 14.34 | 15.47 | -0.84 | -0.07 | 1.05 |
95 | 13.43 | 14.64 | 15.96 | 13.57 | 14.62 | 15.79 | -0.98 | 0.14 | 1.19 |
100 | 13.71 | 14.94 | 16.29 | 13.86 | 14.90 | 16.10 | -1.05 | 0.28 | 1.33 |