Table 1.

Demographic and pesticide results for 89 subjects with measured pesticide levels.

Characteristic	Report of past occupational pesticide exposure (n=36)	Report of no past occupational pesticide exposure (n=53)	Combined population (n=89)	p-Value pesticide exposure vs. no pesticide exposure***
% male	86%	70%	76%	p=0.08
Mean year birth (s.d.)	74 (6)	73 (6)	74 (6)	p=0.56
Mean years of school (s.d.)	4.4 (3.4)	7.3 (5.2)	6.1 (4.7)	p=0.002
% p,p′–DDE<LOD*	3%	9%	7%	p=0.22
% p,p′–DDT<LOD*	16%	26%	22%	p=0.28
% dieldrin<LOD*	25%	55%	43%	p=0.005
% β-HCH<LOD*	0%	0%	0%	p=0.99
Mean p,p′–DDE (s.d.)**	0.70 (0.55)	1.20 (1.46)	1.00 (1.20)	p=0.50
Mean p,p′–DDT (s.d.)**	0.14 (0.08)	0.12 (0.12)	0.08 (3.74)	p=0.08
Mean dieldrin (s.d.)**	7.58 (19.63)	3.40 (6.48)	5.09 (13.50)	p=0.01
Mean β-HCH (s.d.)	0.78 (0.30)	0.73 (0.19)	0.75 (0.24)	p=0.69

^*LODs for β-HCH, dieldrin, p,p′–DDT and p,p′–DDE, were 0.10, 0.25, 0.05, and 0.05 ng/ml, respectively.

^**Units are ng/ml. Means calculated using imputed values for values of p,p′–DDE, p,p′–DDT, and dieldrin below LOD.

^***p-Values based on chi-square test for categorical data, and t-test using the log of pesticide values for comparison of means.