Multivariate Logistic Regression Models for the Association Between Depression and Total Blood Mercury, Stratified by Age Group, NHANES, United States, 2005–2008.

Abbreviations: CI–Confidence Interval; NHANES–National Health and Nutrition Examination Survey; OR–Odds Ratio.
*P<0.05.
aModel 1: adjusted for age in 5-year intervals, sex, and race/ethnicity.
bModel 2: adjusted for family income-poverty ratio in quintiles, educational attainment, and marital status in addition to covariates in model 1.
cModel 3: adjusted for current smoking status, self-reported drinking, and body mass index (BMI) in addition to covariates in model 2.
dModel 4: adjusted for self-reported past 30 days fish intake, and past 24 hours PUFA (EPA or DHA) intake in tertiles in addition to covariates in model 3.
eSimulation: adjusted for covariates in model 4, except that past 30 days fish intake (self-reported yes/no; r = −0.03 with depression) was replaced by simulated fish intake (normally distributed; r = −0.15 with depression) in tertiles; the simulated variable was generated based on the assumption that fish intake and depression were at least mildly correlated if recall bias to the self-report measure could be reduced.