Figure 1

Risk of death from cardiovascular disease associated with five categories of lifetime lactation duration for women <65 years (n = 15,500) with lifetime lactation duration ≥ 24 months as the reference category: Hazard ratios and 95% confidence intervals. Adjusted for age, smoking status, physical activity, education, marital status and parity. Number of women in each category of lifetime duration of breastfeeding, with number of deaths in brackets, 0 months: n = 532 (11), 1–6 months: n = 3,286 (24), 7–12 months: n = 3,951 (15), 13–23 months: n = 4,662 (38), ≥ 24 months: n = 3,069 (21).