Table 1: Response Rate, Crude and Adjusted* Point Prevalence and Cumulative Prevalence of Rheumatoid Arthritis According to Age and Sex in a Random Sample of the Population in the Southern Part of Denmark (95% Confidence Interval)

Females Males Females and Males
15-59 60+ All 15-59 60+ All 15-59 60+ All
Response rate, % 70 76 72 58 77 64 64 77 68
Prevalence, responders
Responders, n 1235 642 1877 993 532 1525 2228 1174 3402
Modified 1987 ACR, n 3 7 10 0 5 5 3 12 15
Point prevalence, % 0.24(0.05-0.71) 1.09(0.44-2.23) 0.53(0.26-0.98) 0(0.00-0.37) 0.94(0.31-2.18) 0.33(0.11-0.76) 0.14(0.03-0.39) 1.02(0.53-1.78) 0.44(0.25-0.73)
Adjusted point prevalence, % 0.46(0.17-0.74) 0.24(0.03-0.44) 0.35(0.17-0.52)
Ever RA, n 10 17 27 1 10 11 11 27 38
Cumulative prevalence, % 0.81(0.39-1.48) 2.65(1.55-4.21) 1.44(0.95-2.10) 0.10(0.00-0.56) 1.88(0.91-3.43) 0.72(0.36-1.29) 0.49(0.25-0.88) 2.30(1.52-3.33) 1.12(0.79-1.53)
Adjusted cumulative prevalence, % 1.27(0.79-1.76) 0.55(0.22-0.79) 0.92(0.62-1.21)
Prevalence, total sample
Total sample, n 1757 840 2597 1709 689 2398 3466 1529 4995
Modified 1987 ACR, n 3 7 10 0 5 5 3 12 15
Point prevalence, % 0.17(0.04-0.50) 0.83(0.34-1.71) 0.39(0.19-0.71) 0(0.00-0.22) 0.73(0.24-1.69) 0.21(0.07-0.49) 0.09(0.02-0.25) 0.79(0.41-1.37) 0.30(0.17-0.50)
Adjusted point prevalence, % 0.34(0.13-0.55) 0.18(0.02-0.34) 0.26(0.13-0.39)
Ever RA, n 10 21 31 1 10 11 11 31 42
Cumulative prevalence, % 0.57(0.27-1.05) 2.50(1.55-3.80) 1.19(0.81-1.69) 0.06(0.00-0.33) 1.45(0.70-2.65) 0.46(0.23-0.82) 0.32(0.16-0.57) 2.03(1.38-2.87) 0.84(0.61-1.14)
Adjusted cumulative prevalence, % 1.06(0.68-1.43) 0.41(0.17-0.65) 0.75(0.52-0.97)

* Adjusted for age or age and sex to the 2004 Danish population using the direct method. Case definitions: Modified 1987 ACR, fulfilment of the modified 1987 American College of Rheumatology (ACR) criteria for rheumatoid arthritis at examination. Ever RA fulfilment of the 1987 ACR criteria documented in medical records or by questionnaire or fulfilment of the modified 1987 ACR criteria at examination.