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Table 2 Incidence of primary THA during the study period

From: Decrease in the incidence of total hip arthroplasties in patients with rheumatoid arthritis - results from a well defined population in south Sweden

Year

Mean age*

Primary THA (n)

Person-years (pyr)

Incidence/1,000 pyr

95% CI

1998

60.2

13

1,341

9.69

5.16 to 16.58

1999

60.5

21

1,361

15.43

9.55 to 23.59

2000

60.9

16

1,381

11.59

6.62 to 18.81

2001

61.0

19

1,398

13.59

8.18 to 21.22

2002

61.0

10

1,397

7.16

3.43 to 13.16

2003

61.1

13

1,431

9.08

4.84 to 15.53

2004

61.2

5

1,461

3.42

1.11 to 7.99

2005

61.2

6

1,490

4.03

1.48 to 8.76

2006

61.7

12

1,467

8.18

4.23 to 14.29

  1. THA, total hip arthroplasty. * Mean age for all observed patients in the cohort at the start of each calendar year
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Arthritis Research & Therapy

ISSN: 1478-6362

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