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Table 1 Clinical findings in athletes and controls

From: Electrocardiographic pattern of apparently healthy African adolescent athletes in Nigeria

Variables Athletes Controls Test statistics P – value
Mean age (years) 14.46 ± 1.76 13.11 ± 1.75 t = 7.294 < 0 .001
Mean BMI (kg/m2) 20.13 ± 2.85 20.43 ± 4.19 t = − 0.782 0.435
Mean oxygen saturationa(%) 97.47 ± 1.32 97.77 ± 1.20 t = −2.29 0.220
Mean pulse rate (bpm) 81.93 ± 12.83 87.22 ± 13.91 t = −3.747 < 0.001
Pulse rate categories
 Bradycardia (< 60 bpm) 4 (2.2) 1 (0.6)   
 Normal (60–100 bpm) 161 (89.4) 150 (83.3) χ2 = 6.644 0.036
 Tachycardia (> 100 bpm) 15 (8.3) 29 (16.1)   
Blood Pressure (first measurement)
 Low (<5th centile)b 1 (0.6) 3 (1.7)   
 Normal (5th to 90th centile)b 163 (90.6) 170 (94.4) χ2 = 4.669 0.097
 Elevated (> 90th centile)b 16 (8.9) 7 (3.9)   
Heart Murmur
 Absent 176 (97.8) 180 (100.0) χ2 = 4.045 0.044
 Present (systolic ≤ grade 2/6) 4 (2.20) 0 (0.0)   
BMI classification
 Underweight 56 (31.1) 66 (36.7)   
 Normal weight 112 (62.2) 93 (51.7) χ2 = 6.767 0 .080
 Overweight 11 (6.1) 15 (8.3)   
 Obesity 1 (0.6) 6 (3.3)   
  1. bpm Beats per minute, BMI Body mass index aobtained by pulse oximetry bderived from Blood pressure centile chart from the Fourth Report on the diagnosis, evaluation and treatment of high blood pressure in children and adolescents