Fig 1. Associations of hypertension (HTN) and summary measure of organochlorine (OC) pesticides with the risk of low cognitive score (<25th % of study subjects, 28 of 133 symbols correctly substituted).

The summary measure was calculated by summing the rank orders of the individual 4 compounds (p,p’-DDT, p,p’-DDE, β-hexachlorocyclohexane, and trans-nonachlor) which showed little association in the 1st tertile, but the significant positive association in the 3rd tertile in Table 3. Odds ratios were estimated using a common reference group of elderly without HTN within the 1st tertile of OC pesticides, adjusted for age, sex, race-ethnicity, education, poverty income ratio, cigarette smoking, and body mass index. The upper fig A used tertiles of the summary measure of OC pesticides, while the lower fig B further categorized the last tertile by the cutoff point of 90%. Statistically significant odds ratios were marked with *. T1, first tertile; T2, second tertile; T3, third tertile. Sample sizes are given in Table 3.