Table 4. Multivariable Cox regression analysis for the correlates of mortality by forward stepwise method and bootstrap results.

	Hazzard ratio: Exp(β)	95%CI	P	Bootstrap Results (2000 Replicas)
				Bias	S.E	95% CI	P
diabetes states(No = 0, Yes = 1)	4.981	2.107 to 11.77	<0.001	0.041	0.493	0.719 to 2.778	<0.001
Age (per 1 year)	1.052	1.014 to 1.091	0.006	0.002	0.025	0.006 to 0.110	0.023
C2/(C16+C18:1) (per 1)	0.937	0.904 to 0.971	<0.001	-0.001	0.016	-0.096 to -0.037	<0.001

footnote: C2,Acetylcarnitine; C16, Palmitoylcarnitine; C18:1 Octadecenoylcarnitine.