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. Author manuscript; available in PMC: 2013 Oct 15.
Published in final edited form as: Environ Int. 2012 Jun 23;47:28–36. doi: 10.1016/j.envint.2012.06.002

Table 3.

Linear regression model (GEE) for the logarithmic transformation of the sum of Diethyl-substituted metabolites (DEAP) in the urine of schoolchildren in Talca Province, Chile in December 2010 (summer) and May 2011 (fall) combined.

DEAP* Coef. Std. Err. P-value
Chlorpyrifos (a) 1.03 0.088 0.000
Creatinine (b) 0.50 0.088 0.000
Location (c) -0.21 0.901 0.018
Distance from farms (d) 0.15 0.086 0.074
Age (e) -0.24 0.083 0.004
Empedrado (f) 0.00 0.135 0.984
Talca (f) 0.25 0.110 0.021
San Clemente (f) -0.04 0.118 0.712
Constant 4.1 0.170 0.000

n of observations=371; n of groups=190

*

Logarithmic transformation of the sum of DEAPs in schoolchildren urine.

(a)

Exposed =1, Unexposed=0, to chlorpyrifos residues in fruits/vegetables from either homes or schools.

(b)

Continuous measure of creatinine in urine of children (g/L).

(c)

Geographic location (urban=1, rural=0)

(d)

Distance of housing to farms that applied pesticides (Less than 500m=1, greater than 500 m=0).

(e)

Age of children categorized as 6 - 8 years old (=1) or 9 – 12 years old (=0).

(f)

County (reference = Maule)