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Table 5 Mean Values for ECG Parameters for Children and Adolescents with or without History of Stimulant Treatment

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

ECG Variable Stimulant Naive (n = 2239) Mean (SD) Stimulant Experienced (n = 3572) Mean (SD) P value
Heart Rate (bpm) 77.5 (11.7) 78.3 (12.7) *
RR Interval (ms) 791.3 (121.4) 786.6 (130.5)  
PR Interval (ms) 136.6 (18.7) 136.1 (18.3)  
QRS Interval (ms) 82.0 (9.0) 83.4 (9.6) ***
QT Interval (ms) 366.2 (26.2) 367.4 (29.0)  
QTc    
   Bazett (ms) 413.1 (20.5) 415.9 (21.1) ***
   Data-derived (ms) 401.4 (18.1) 403.7 (19.0) ***
   Fridericia (ms) 396.8 (18.0) 399.0 (19.1) ***
  1. * P ≤ .05, ***P ≤ .001