Table 2.

Multivariate Cox Model Hazard Ratios

Factor	Hazard Ratio	95% CI	P‐Value
(A) For cardiac events without the inclusion of QTc in the model
African‐American:Caucasian	1.10	0.68–1.79	0.70
Male:Female 0–13 years	1.29	1.09–1.52	<0.01
Female:Male 14–40 years	2.28	1.85–2.81	<0.001
Time‐dependent β‐blocker use (yes:no)	0.62	0.48–0.78	<0.001
(B) For cardiac events with inclusion of QTc in the model
African‐American:Caucasian	0.93	0.57–1.50	0.76
QTc ≥ 500 ms	2.10	1.87–2.37	<0.001
Male:Female 0–13 years	1.28	1.08–1.50	<0.01
Female:Male 14–40 years	2.32	1.88–2.85	<0.001
Time‐dependent beta‐blocker use (yes:no)	0.55	0.44–0.70	<0.001