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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Heart Rhythm. 2010 May 15;7(8):1077–1084. doi: 10.1016/j.hrthm.2010.05.018

Table 3.

Survival by QT-500 quartile

Q1 Q2 Q3 Q4 p
QT at 500 ms 288 ± 10 299 ± 2 307 ± 3 325 ± 14 N/A
N 749 748 749 748
Dead 46 44 52 86 <0.001
Mortality (%) 6.1 5.9 6.9 11.5
Length of survival (years) 7.7 ± 1.9 7.6 ± 1.8 7.6 ± 1.8 7.3 ± 2.0 0.0005
Incidence (per 1000 patient years) 8.0 7.7 9.1 15.7