Table 7.

Significant logistic regression models predicting wetland soil lead concentration above/below a background concentration of 35 mg/kg. Numbers are the regression coefficients (odds ratios) for the significant disturbance variables in each model (subpopulation codes are given in Table 1, variable codes are given in Table 2). R² is McFaddens R² for logistic regression

Subpopulation	R2	Fill	VegRemoval	%Agr	%Dev	%Imp	%Rec	PopDen	HydroMod
National	0.1			0.87			1.12	2.31*
CPL	0.07							2.67*
EMU	0.11		0.73					2.29*
IPL	0.34							7.40*
W	0.11								1.26*
EH	0.16				2.22*				1.34
PRLH	0.19			0.81		0.44		4.34*
PRLW	0.07			0.83				2.11*
Depressions	0.21	0.52		0.79		0.41		4.85*
Riverine	0.08							2.73*

*Variable significant in model at p < 0.001, all other variables significant at p < 0.05