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Table 2 QTc compared between groups

From: QTc interval-dependent body posture in pediatrics

QTc between groupsCase group (N = 17)Control group (N = 34)Differencep
QTc in supine position mean (ms)423.7 (SD 27.4)391.4 (SD 22.4)32.3< 0.001
QTc in standing position mean (ms)443.5 (SD 39.5)403.3 (SD 21.3)40.2< 0.001
QTc change mean (ms)19.7 (SD 24.5)11.9 (SD 26.7)7.80.308
QTc > 440 m in supine position n (%)4/17 (23.6%)0/34 (0%)40.003
QTc > 440 m in standing position n (%)8/17 (47.0%)0/34 (0%)8< 0.001
  1. Ms milliseconds, SD Standard deviation