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Table 2 Mean and Percentiles of ECG Cardiac Measures Among Pre-pubertal Children

From: Baseline values from the electrocardiograms of children and adolescents with ADHD

ECG Variable Mean (sd) 1st %ile 5th %ile Median 95th %ile 99th %ile
Heart Rate (bpm) 83.0 (12.1) 59.0 65.0 82.0 104 114.0
RR Interval (ms) 738.5 (107.8) 526.3 576.9 731.7 923.1 1040.0
PR Interval (ms) 132.8 (17.3) 100.0 108.0 130.0 162.0 180.0
QRS Interval (ms) 80.0 (9.0) 64.0 70.0 80.0 96.0 102.0
QT Interval (ms) 354.7 (24.3) 300.0 318.0 352.0 396.0 416.0
QTc Bazett (ms) 414.0 (19.6) 367.0 383.0 414.0 443.0 460.0
QTc Data-derived (ms) 399 (17.3) 357.4 372.0 398.7 424.1 439.6
QTc Fridericia (ms) 393.2 (17.1) 353.3 366.3 392.9 419.0 433.0
  1. Note: Pre-pubertal group (N = 1537) defined as females whose age was ≤ 8 years (n = 224) and males whose age was ≤ 9 years (n = 1313)-
  2. Abbreviations: RR, Duration of ventricular cardiac cycle (an indication of ventricular rate); PR, Time from the onset of atrial depolarization (P wave) to onset of ventricular depolarization (QRS complex); QTcb, Bazett's method for QT interval correction; QTcd, Data-derived corrected method for QT interval correction; QTcf, Fridericia's method for QT interval correction.