Fig 1. Associations of age and 6 organochlorine (OC) pesticides on the risk of low cognitive score (<25th percentile of study subjects, 28 of 133 symbols correctly substituted).
Odds ratios were estimated using logistic regression with a common reference group of elderly in the 1st quintile of age and the combined 1st plus 2nd tertile of each OC pesticide, adjusted for age, sex, race-ethnicity, education, poverty income ratio, cigarette smoking, body mass index, physician-diagnosed heart disease, physician-diagnosed hypertension, and physician-diagnosed diabetes. Statistically significant odds ratios were marked with *. Q1, first quintile (60–63 years); Q2, second quintile (64–67 years); Q3, third quintile (68–72 years); Q4, forth quintile (73–79 years); Q5, fifth quintile (80–85 years); T1+T1, first and second tertiles; T3, third tertile