Table 4.

Logistic regression model of skin and liver neoplasia prevalence excluding sampling year as a factor, including parameter estimates, Z scores, and associated p-values (p <0.05 in bold). For skin neoplasia, the full model p = 0.001. For liver neoplasia, the full model p = 0.027.

Tissue	Parameter	Estimate (±SE)	Z	p-value
skin	Constant	4.37 (0.92)	4.77	<0.001
	Sex (F)	1.34 (0.57)	2.34	0.019
	Age	−0.24 (0.07)	−3.4	<0.001
	% Lake	0.66 (1.20)	0.55	0.581
	% Lower River	−0.04 (1.37)	−0.03	0.975
liver	Constant	4.44 (0.90)	4.92	<0.001
	Sex (F)	0.40 (0.46)	0.87	0.385
	Age	−0.20 (0.07)	−2.98	<0.001
	% Lake	−0.05 (1.17)	−0.04	0.969
	% Lower River	−0.09 (1.35)	−0.07	0.946