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Table 1 Baseline characteristics of the study subjects

From: Sex differences in response to maximal exercise stress test in trained adolescents

  Females (n = 24) Males (n = 27) P-value
Age (years) 16.5 ± 1.8 17.0 ± 1.3 0.26
Height (cm) 168 ± 5 179 ± 6 P < 0.001
Weight (kg) 61.3 ± 9.2 69.7 ± 9.1 P = 0.002
BMI (kg/m2) 21.6 ± 2.8 21.7 ± 2.7 P = 0.84
Training pr week (hours) 7.4 ± 1.6 8.8 ± 1.3 P = 0.002
Total body fat (kg/%) 15.1 ± 5.3/23.1 ± 6.5 8.9 ± 4.2/12.7 ± 5.1 P < 0.001
Total body fat free mass (kg) 46.6 ± 5.3 60.7 ± 7.7 P < 0.001
Total leg muscle mass (kg) 15.0 ± 1.9 20.0 ± 2.7 P < 0.001
Hemoglobin (g/l) 132 ± 6 147 ± 8 P < 0.001
Creatinine (μmol/l) 65 ± 10 78 ± 9 P < 0.001
Resting ECG parameters
PR interval (msec) 149 ± 21 (149 ± 21; N = 23) 144 ± 14 P = 0.39
QRS duration (msec) 95 ± 20 (92 ± 7.6; N = 23) 99 ± 9.9 P = 0.43
QTc (msec) 440 ± 36 (435 ± 25; N = 23) 417 ± 20 P = 0.007
P axis (°) 52 ± 26 (52 ± 26; N = 23) 50 ± 28 P = 0.79
QRS axis (°) 65 ± 38 (70 ± 29; N = 23) 80 ± 24 P = 0.10
T axis (°) 59 ± 47 (50 ± 17; N = 23) 54 ± 17 P = 0.57
  1. Values are expressed as mean ± SD. Rows in bold denotes a statistical significant difference (P < 0.05) between females and males. P-values represent values after correction for multiple testing. In the section reporting ECG parameters female data is presented with (N = 24) and without (N = 23; parentheses) inclusion of the subject with WPW-type pre-excitation.