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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%
Total43,219100
1No differences in GA between LMP & US438110.1
1.aDiscrepancy between LMP & US +/−  4 days19,01643.9
1.bDiscrepancy between LMP & US +/−  7 days26,64461.6
2Over-estimation of GA by LMP22,20151.4
2.aGA > 70 days based on LMP & < =70 based on US30807.1
2.bGA > 90 days based on LMP & < =90 based on US5311.2
3Under-estimation of GA by LMP16,63738.5
3.aGA < =70 days based on LMP & > 70 based on US27016.2
3.bGA < =90 days based on LMP & > 90 based on US17094.0
  1. Note: Percentages in bold add 100%