Table 2

12-channel electrocardiography (ECG) in patients with juvenile dermatomyositis (JDM) (median 16.8 years after onset) and controls

Patients with JDMControlsp Value
Pathological10 (17)4 (7)0.054*
Pathological/borderline23 (39)14 (25)0.020*
PR, ms139 (19)146 (22)0.082
QRS, ms91 (11)90 (12)0.385
QTc, ms405 (24)407 (23)0.631
Cornell, mm × ms†1451 (550)1157 (478)0.002

  • Values are number (%) or mean (SD); n=56 pairs (three missing due to technical problems).

  • ↵* One-tailed t test.

  • ↵† n=41 pairs (Cornell criteria are only applicable in patients ≥16 years).

  • Cornell, Cornell voltage × QRS duration product; PR, PR interval; QRS, QRS duration; QTc, corrected QT interval.