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Table 1 Crown-rump length (CRL) measurements in relation to gestational age for the original equation fit reported by Verburg et al.[2] compared to our model fit of the simulated data

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 reported equation Equation from the simulated data  
CRL (mm) Median GA (Weeks) predicted from CRL Median GA (Weeks) predicted from CRL Difference in GA (days)
5 6.336 6.324 0.082
10 7.503 7.497 0.041
15 8.312 8.310 0.015
20 8.962 8.962 -0.003
25 9.519 9.521 -0.017
30 10.015 10.019 -0.026
35 10.469 10.474 -0.032
40 10.892 10.897 -0.035
45 11.290 11.296 -0.036
50 11.670 11.675 -0.036
55 12.034 12.039 -0.033
60 12.386 12.390 -0.029
65 12.727 12.731 -0.023
70 13.060 13.063 -0.016
75 13.386 13.387 -0.008
80 13.706 13.706 0.001
85 14.021 14.019 0.012
90 14.331 14.328 0.023
95 14.638 14.633 0.036
100 14.942 14.935 0.050