Risk factor

Exposed

Unexposed

Risk Ratio
(95% CI);
p-value1

Incident Cases

Total patients

Attack rate %

Incident Cases

Total patients

Attack rate %

Age > 68 years2

3

24

12.5

4

28

14.3

0.875 (0.217 – 3.527); >0.999

Male gender

4

17

23.5

3

35

8.6

2.745 (0.691 – 10.910); 0.295

Race: White

4

15

26.7

3

38

7.9

3.378 (0.856 – 13.320); 0.179

Cause of renal failure: Hypertension

4

35

11.4

3

17

17.6

0.648 (0.163 – 2.575); 0.827

Diabetes mellitus

2

28

7.1

5

22

22.7

0.314 (0.067 – 1.469); 0.245

Dialysis >34 months2

3

25

12

4

27

14.8

0.810 (0.201 – 0.267); >0.999

Dialyzed on MWF schedule

6

30

20.0

1

22

4.3

4.400 (0.570 – 33.980); 0.226

Dialyzed on 1st shift

1

25

4.0

6

27

22.2

0.180 (0.023 – 1.392); 0.124

Received epogen alpha3

4

26

15.4

3

26

11.5

1.333 (0.331 – 5.378); >0.999

Received paricalcitol3

5

27

18.5

2

25

8.0

2.315 (0.493 – 10.870); 0.486

Received iron sucrose3

4

26

15.4

3

26

11.5

1.333 (0.331 – 5.378); >0.999

Received sodium chloride3

4

26

15.4

3

26

11.5

1.333 (0.331 – 5.378); >0.999

CI: Confidence Interval
MWF: Monday, Wednesday, and Friday
Attack Rate: Number incident cases / number total patients x 100
1: Two-sided Fisher exact p-value
2: Cohort median
3: Received greater than cohort median value
Table 1: Risk for hepatitis C virus infection among cohort of 7 incidence case-patients and 45 HCV susceptible patients according to selected patient and hemodialysis treatment risk factors, November 2005 to May 2006.