Table 2.

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

	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

Note: Percentages in bold add 100%