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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