Fig. 1

Cubic spline regression model between the total dietary antioxidant capacity (TRAP; mmol/day) and HRs for hypertension; E3N cohort, 1993–2008 (n = 40,576). Spline regression: the four knots are the 20th, 40th, 60th and 80th percentiles. The reference value is the minimum total antioxidant capacity. The model was adjusted for smoking status, physical activity, education level, diabetes, hypercholesterolemia, family history of hypertension, energy intake without alcohol, alcohol intake, and BMI. Solid line, HR; dashed lines, 95% CI