Table 3. Association between iron supplementation and all-cause mortality in patients with diabetes mellitus and without diabetes mellitus using time-dependent Cox proportional hazards models^*.

	All-cause mortality
	Diabetes			Non-Diabetes
	HR	(95% CI)	P-value	HR	(95% CI)	P-value
Age (years)	1.03	(0.99–1.07)	0.2	1.07	(1.03–1.10)	<0.001
Sex
Female	Ref.			Ref.
Male	0.98	(0.45–2.11)	0.9	1.08	(0.51–2.31)	0.8
Type of renal replacement therapy
Hemodialysis	Ref.			Ref.
Peritoneal dialysis	0.76	(0.07–8.73)	0.8	0.30	(0.08–1.15)	0.08
Transplantation	-	-	-	0.63	(0.14–2.82)	0.5
Iron supplementation
No	Ref.			Ref.
Yes	0.51	(0.02–1.59)	0.7	0.19	(0.06–0.56)	0.002
C-reactive protein (mg/dL)	1.09	(1.04–1.14)	0.001	1.17	(1.12–1.22)	<0.001
Albumin (g/dL)	0.24	(0.11–0.49)	<0.001	0.40	(0.22–0.71)	0.002
Hemoglobin (g/dL)	0.79	(0.63–0.97)	0.03	1.09	(0.89–1.35)	0.4

* Adjusted for age, sex and the time-dependent variables type of renal replacement therapy, C-reactive protein, albumin and hemoglobin.