This study also evaluated work- versus home-related pesticide exposure. The stronger relationships observed with work-related pesticide exposure are consistent with the tendency for workers to be exposed to higher quantities and frequencies of use than occurs with residential use. Thus, grouping home use and occupational use together may result in exposure misclassification and lead to a dilution of risk estimates. Recall of pesticide use, however, is generally expected to be more accurate among workers
than the general population [29, 30]. This would likely lead to non-differential misclassification among residential users, which would typically bias the OR toward the null.