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Table 2 Estimated gestational age in relation to crown-rump length (CRL) measurements for the original equation reported by Verburg and a model fitted to the simulated data (Approach 1)

From: Estimation of gestational age in early pregnancy from crown-rump length when gestational age range is truncated: the case study of the INTERGROWTH-21stProject

  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