Table 2.

Factors associated with hospital utilization (hospital days per patient-year at risk)a

First 3 MonthsAfter 3 Months
VariableRelative Risk95% Confidence IntervalRelative Risk95% Confidence Interval
aMultivariate model adjusted for the interaction between race and severe anemia.
bDiabetes mellitus as a cause of ESRD.
Age (yr)
18 to 440.40.2 to 1.00.60.2 to 1.7
45 to 640.50.3 to 1.01.00.5 to 2.1
65 to 750.50.3 to 1.00.90.4 to 1.8
>75 (ref)1.01.0
Female gender (ref = male)0.90.6 to 1.51.50.8 to 2.7
Diabetes mellitusb (ref = non-diabetes mellitus)1.61.0 to 2.71.50.9 to 2.7
Insurance
non-HMO (ref = HMO)9.92.3 to 42.11.30.5 to 3.3
Ischemic heart disease present (ref = absent)1.71.0 to 2.81.81.0 to 3.3
Year of dialysis
10/92 to 9/941.60.9 to 2.82.41.3 to 4.4
10/94 to 9/961.30.7 to 2.50.80.5 to 1.5
10/96 to 9/98 (ref)1.0
Late referral (ref = early)2.01.2 to 3.41.00.5 to 1.9
Temporary access for first dialysis (ref = permanent)1.91.2 to 2.91.40.8 to 2.4