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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