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Table 2 Proportion of under/over-estimation of GA based on LMP compared with US, N = 43,219, Mexico City ILE program

From: Early termination of pregnancy: differences in gestational age estimation using last menstrual period and ultrasound in Mexico

 

Overall Sample

  
 

n

%

Total

43,219

100

1

No differences in GA between LMP & US

4381

10.1

1.a

Discrepancy between LMP & US +/−  4 days

19,016

43.9

1.b

Discrepancy between LMP & US +/−  7 days

26,644

61.6

2

Over-estimation of GA by LMP

22,201

51.4

2.a

GA > 70 days based on LMP & < =70 based on US

3080

7.1

2.b

GA > 90 days based on LMP & < =90 based on US

531

1.2

3

Under-estimation of GA by LMP

16,637

38.5

3.a

GA < =70 days based on LMP & > 70 based on US

2701

6.2

3.b

GA < =90 days based on LMP & > 90 based on US

1709

4.0

  1. Note: Percentages in bold add 100%