Association between the plasma/whole blood lead ratio and history of spontaneous abortion: a nested cross-sectional study

Table 2 Poisson regression models of history of abortion. Mexico City, Mexico, 1997–2004

Variable (units)	Continuous model	Quantiles model
	IRR*	IRR*
Plasmatic Pb fraction^†	1.123
	[0.017]
Plasmatic Pb fraction tertiles
1st		1.00
		--
2nd		1.161
		[0.612]
3rd		1.903
		[0.015]
Age (years)	0.985	0.984
	[0.477]	[0.432]
Schooling (years)	1.025	1.021
	[0.386]	[0.455]

Poisson multiple regression models of the rate of spontaneous abortions featuring continuous (left column) or categorized (right column) plasma/blood Pb ratio as predictor variables, both models are adjusted for age and schooling
* Incidence Rate Ratio, p-values in brackets
† IRR for a 0.1 percentage point increase in the plasmatic fraction of Pb

ISSN: 1471-2393