Fig. 1
From: Association of dietary flavonoid intakes with prevalence of chronic respiratory diseases in adults
The exposure–response associations of dietary flavonoid intake and chronic respiratory diseases (CRDs) by restricted cubic spline (RCS) model in adults. Model was adjusted for age (< 40, 40–59, or > 59), sex (male or female), race/ethnicity (Mexican American, Other Hispanic, Non-Hispanic White, Non-Hispanic Black or Other), education level (below high school, high school, or above high school), family poverty income ratio (≤ 1.0, 1.1–3.0, or > 3.0), smoking status (never smoker, former smoker, or current smoker), energy intake levels (in tertiles), metabolic syndrome (yes or no), and supplement use (yes or no)