Table 2.

Incidence rate ratios of admission and mortality risk according to HD frequency in the combined and transfer groups

Outcome	Event	Person-years	Rate	SHR (95% CI)	p-value
Admission
Combined group
Overall (N = 688)	646	328	1969.17	1.06 (0.95–1.19)	0.32
HD sessions = 2 (N = 350)	328	209	1570.58	0.96 (0.84–1.10)	0.56
HD sessions = 3 (N = 28)	26	13	2059.98	1.11 (0.74–1.66)	0.61
HD sessions = 4 (N = 310)	292	107	2739.33	1.18 (1.03–1.35)	0.02
Transfer group	628	379	1656.15	Ref.
Outcome	Event	Person-years	Rate	HR (95% CI)	p-value
Mortality
Combined group
Overall (N = 688)	145	2413	60.09	1.02 (0.80–1.30)	0.88
HD sessions = 2 (N = 350)	79	1430	55.23	1.02 (0.77–1.37)	0.88
HD sessions = 3 (N = 28)	6	116	51.66	1.31 (0.57–2.99)	0.52
HD sessions = 4 (N = 310)	60	867	69.24	1.00 (0.73–1.36)	0.98
Transfer group	155	2257	68.68	Ref.

Rate, per 1000 person-years; SHR subdistribution HR

Adjusted for age, sex, diabetes, chronic heart failure, Charlson comorbidity index, recent peritonitis, and type of vascular access for HD