Three sets of analyses were considered for mood, anxiety, and comorbid disorders. First, overall proportions were estimated by the age categories young-old, mid-old, old-old, and oldest old. Second, age differences were examined by sex. Finally, age differences were examined by race/ethnicity. To statistically test if prevalence trends across age groups were different between men and women and between race/ethnic categories, interaction terms with age modeled as continuous (and main effects) were examined in logistic regression analyses, correcting for the complex sampling design. Because overall prevalence rates were similar and prevalence patterns with age were similar across race/ethnic groups, subgroup results by race/ethnicity are not presented.