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Table 4 Group 1 (training related) ECG findings in athletes and controls

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

ECG Abnormality Athletes (N = 180)
n (%)
Controls (N = 180)
n (%)
Test statistic χ2 P value
First Degree AV Block
 Present 9 (5.0) 1 (0.6) 6.583a 0.020
LVH
 Present 20 (11.1) 7 (3.9) 6.767 0.009
Sinus Bradycardia
 Present 9 (5.0) 1 (0.6) 6.583a 0.020
Ectopic atrial rhythm
 Present 0 (0.0) 2 (1.1) 2.011a 0.499
Junctional Rhythm
 Present 0 (0.0) 1 (0.6) 1.003a 0.500
IRBBB
 Present 11 (6.1) 6 (3.3) 1.543 0.214
Sinus Arrhythmia
 Present 5 (2.8) 14 (7.8) 4.501 0.034
Early Repolarization changes
 Present 6 (3.3) 1 (0.6) 3.642a 0.121
Total 60 (33.3) 33 (18.3)   
  1. IRBBB Incomplete Right Bundle Branch Block, LVH Left ventricular hypertrophy
  2. aDerived by Fisher’s exact test