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Table 6 Mean Values for ECG Parameters for Caucasians and Non-Caucasians

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

ECG Variable Caucasian (n = 4627) Mean (SD) Non-Caucasian (n = 1303) Mean (SD) P value
Heart Rate (bpm) 78.3 (12.5) 76.8 (11.7) ***
RR Interval (ms) 785.2 (127.8) 799.6 (123.4) ***
PR Interval (ms) 135.3 (18.2) 139.7 (18.8) ***
QRS Interval (ms) 83.5 (9.4) 80.8 (9.0) ***
QT Interval (ms) 366.8 (28.2) 367.2 (27.0)  
QTc    
   Bazett (ms) 415.5 (20.8) 412.2 (20.8) ***
   Data-derived (ms) 403.3 (18.7) 400.9 (18.7) ***
   Fridericia (ms) 398.5 (18.7) 396.6 (18.6) ***
  1. ***P ≤ .001