Table 2

 An association between a polymorphism in the GSTP1 gene and Parkinson’s disease is strongest in the subgroup of subjects exposed to pesticides8

Exposure statusGSTP1 genotype at codon 105Parkinson’s disease casesControlsOdds ratio (p value)*
*p Values calculated using Woolf’s formula for the standard error of the log odds ratio.22
All subjectsIle/Ile3339
Ile/Val, Val/Val62561.31 (p = 0.0.370)
Subjects exposed to pesticides onlyIle/Ile714
Ile/Val, Val/Val32125.33 (p = 0.004)