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Table 3 Incidence of primary TKA 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 knee TJR (n) Person-years (pyr) Incidence/1000 pyr 95% CI
1998 60.6 9 1,369 6.57 3.01 to 12.48
1999 61.0 5 1,395 3.58 1.16 to 8.36
2000 61.5 6 1,423 4.22 1.55 to 9.18
2001 61.6 7 1,439 4.86 1.96 to 10.02
2002 61.6 4 1,442 2.77 0.76 to 7.10
2003 61.7 14 1,463 9.57 5.23 to 16.06
2004 61.7 10 1,480 6.76 3.24 to 12.43
2005 61.6 12 1,491 8.05 4.16 to 14.06
2006 62.2 6 1,467 4.09 1.50 to 8.90
2007 62.9 9 1,062 8.47 3.88 to 16.09
  1. TKA, total knee arthroplasty. * Mean age for all observed patients in the cohort at the start of each calendar year