Characteristics of participants with Body Mass Index (BMI) measured at baseline, and comparison according to BMI category.

*P value: Students t test, Pearson's chi-square test for trends and the Kruskal Wallis test for differences between means, frequencies and medians, respectively †Major ECG abnormalities were defined by the following alterations and Minnesota codes (MC): ventricular conduction defect (MC 7.1, 7.2, 7.4, or 7.8); possible old myocardial infarction (MC1.1.x, 1.2.x and 1.3.x and (4.1.x, 4·2, 5·1, or 5·2)), major isolated ST segment and T wave abnormalities (MC 4.1.x, 4.2, 5.1, or 5.2), left ventricular hypertrophy (MC 3.1 and (4.1.x, 4.2, 5.1, or 5.2)), atrial fibrillation (MC 8.3.1, 8.3.3), major atrio-ventricular conduction abnormalities (MC 6.1.1, 6.2.1, 6.2.2, 6.2.3, 6.4.1, 8.6.1, 8.6.2), pacemaker use (MC 6.8.1), other major arrhythmias (MC 8.2.1, 8.2.2, 8.2.3, 8.2.4, 8.3.2, 8.3.4, 8.4.·2), frequent supraventricular and ventricular premature beats (MC 8.1.1, 8.1.2 or 8.1.3) ‡ Leisure physical activity (walking or any other physical exercise) for at least 20–30 min, ≥3–5 times/week § Education: lower category-never studied, intermediate category −