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Table 1 Characteristics of the study population

From: Prevalence of abnormal and borderline electrocardiogram changes in 13, 079 Chinese amateur marathon runners

  Men Women Total
n 9897 (75.7%) 3182 (24.3%) 13,079 (100%)
Full marathon 4102 (83.8%) 794 (16.2%) 4896 (100%)
Half marathon 5795 (70.8%) 2388 (29.2%) 8183 (100%)
Age, years
 Mean ± SD 28.6 ± 4.2 27.9 ± 4.1 28.5 ± 4.2
  < 30 years 6220 (62.8%) 2232 (70.1%) 8452 (64.6%)
 30–35 years 3677 (37.2%) 950 (29.9%) 4627 (35.4%)
 Height, cm 173.6 ± 5.2 162.5 ± 4.8 170.6 ± 6.7
 Weight, kg 67.9 ± 8.9 54.8 ± 8.6 65.0 ± 10.0
 BMI, kg/m2 22.4 ± 2.2 20.3 ± 2.2 22.2 ± 2.2
 Overweight, n(%) 1853 (20.3%) 74 (2.5%) 1927 (16.0%)
 Obesity, n(%) 94 (1.0%) 25 (0.7%) 114 (0.9%)
Finishing time
 Full marathon, Mean (SD) 4h22min (42 min) 4h47min (39 min) 4h26min (42 min)
   < 3 h 25 (0.6%) 2 (0.3%) 27 (0.6%)
  3–4 h 1120 (27.3%) 67 (8.4%) 1187 (24.2%)
  4–5 h 1955 (47.7%) 361 (45.5%) 2316 (47.3%)
   > 5 h 1002 (24.4%) 364 (45.8%) 1366 (27.9%)
 Half marathon, Mean (SD) 2h10min(20 min) 2h22min (17 min) 2h14min (20 min)
   < 2 h 1604 (27.7%) 152 (6.4%) 1756 (21.5%)
  2–3 h 4143 (71.5%) 2187 (91.6%) 6330 (77.4%)
   > 3 h 48 (0.7%) 49 (2.0%) 97 (1.2%)
  1. Note: overweight: BMI ≥ 24 kg/m2 and < 28 kg/m2; obesity: BMI ≥ 28 kg/m2