Fig. 2From: Dietary niacin intake in relation to depression among adults: a population-based studyEffect of niacin intake on depression in different subgroup. Except the stratification variables themselves, each stratification factor was adjusted for all other variables (age, sex, race, marital status, education, family income, smoking, drinking, physical activity, BMI, hypertension, diabetes, energy, n-3 fatty acids, n-6 fatty acids, folate and zinc)Back to article page