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Table 4 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 3)

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 3  
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 6.97 7.29 8.15 -0.60 1.49 0.23
15 7.63 8.31 9.06 7.66 8.17 9.08 -0.26 1.00 -0.14
20 8.22 8.96 9.77 8.23 8.85 9.81 -0.10 0.79 -0.25
25 8.73 9.52 10.38 8.73 9.42 10.42 -0.02 0.68 -0.29
30 9.19 10.02 10.92 9.19 9.93 10.96 0.00 0.62 -0.29
35 9.60 10.47 11.41 9.60 10.39 11.45 0.00 0.57 -0.28
40 9.99 10.89 11.87 9.99 10.81 11.91 -0.02 0.54 -0.26
45 10.36 11.29 12.31 10.36 11.22 12.34 -0.05 0.52 -0.24
50 10.70 11.67 12.72 10.72 11.60 12.75 -0.08 0.50 -0.22
55 11.04 12.03 13.12 11.05 11.96 13.15 -0.11 0.48 -0.20
60 11.36 12.39 13.50 11.38 12.32 13.53 -0.14 0.47 -0.18
65 11.67 12.73 13.87 11.70 12.66 13.90 -0.16 0.47 -0.15
70 11.98 13.06 14.24 12.01 12.99 14.25 -0.17 0.47 -0.12
75 12.28 13.39 14.59 12.30 13.32 14.61 -0.18 0.47 -0.09
80 12.57 13.71 14.94 12.60 13.64 14.95 -0.18 0.48 -0.05
85 12.86 14.02 15.28 12.88 13.95 15.29 -0.16 0.49 -0.01
90 13.15 14.33 15.62 13.17 14.26 15.62 -0.14 0.52 0.04
95 13.43 14.64 15.96 13.44 14.56 15.94 -0.11 0.55 0.10
100 13.71 14.94 16.29 13.72 14.86 16.27 -0.06 0.58 0.16