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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.
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Child and Adolescent Psychiatry and Mental Health

ISSN: 1753-2000