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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