Table 1

Demographic characteristics of 515 patients with rheumatoid arthritis and 769 population controls, Denmark 1998 to 2003

Patients with rheumatoid arthritis

Population controls



Mean age at diagnosis, years (range)a

49 (18 to 65)

48 (16 to 68)

Gender

Women

366 (71.1%)

478 (62.2%)

Men

149 (28.9%)

291 (37.8%)

Birth year

Before 1940

71 (13.8%)

98 (12.7%)

1940 to 1949

171 (33.2%)

250 (32.5%)

1950 to 1959

145 (28.2%)

223 (29.0%)

1960 to 1969

77 (15.0%)

129 (16.8%)

1970 or after

51 (9.9%)

69 (9.0%)

Place of residence

Copenhagen

86 (16.7%)

102 (13.3%)

Suburbs of Copenhagen

90 (17.5%)

137 (17.8%)

Other towns with ≥100,000 inhabitants

78 (15.2%)

77 (10.0%)

Towns with 10,000 to 99,999 inhabitants

93 (18.1%)

197 (25.6%)

Rural areas/towns with <10,000 inhabitants

168 (32.6%)

256 (33.3%)

Educationb

No post-school education

123 (23.9%)

120 (15.6%)

Semi-skilled worker, short education (<1 year) or apprentice

204 (39.6%)

293 (38.2%)

Short or middle length advanced studies (1 to 4 years)

156 (30.3%)

265 (34.5%)

Long advanced studies (>4 years)

32 (6.2%)

90 (11.7%)


aAge in controls calculated as pseudo-year of diagnosis minus birth year. bOne control had missing information about education.

Pedersen et al. Arthritis Research & Therapy 2006 8:R133   doi:10.1186/ar2022

Open Data