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Demographic characteristics of 515 patients with rheumatoid arthritis and 769 population controls, Denmark 1998 to 2003 |
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| Patients with rheumatoid arthritis |
Population controls |
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| Mean age at diagnosis, years (range)a |
49 (18 to 65) |
48 (16 to 68) |
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| Gender |
Women |
366 (71.1%) |
478 (62.2%) |
| Men |
149 (28.9%) |
291 (37.8%) |
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| Birth year |
Before 1940 |
71 (13.8%) |
98 (12.7%) |
| 1940 to 1949 |
171 (33.2%) |
250 (32.5%) |
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| 1950 to 1959 |
145 (28.2%) |
223 (29.0%) |
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| 1960 to 1969 |
77 (15.0%) |
129 (16.8%) |
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| 1970 or after |
51 (9.9%) |
69 (9.0%) |
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| Place of residence |
Copenhagen |
86 (16.7%) |
102 (13.3%) |
| Suburbs of Copenhagen |
90 (17.5%) |
137 (17.8%) |
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| Other towns with ≥100,000 inhabitants |
78 (15.2%) |
77 (10.0%) |
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| Towns with 10,000 to 99,999 inhabitants |
93 (18.1%) |
197 (25.6%) |
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| Rural areas/towns with <10,000 inhabitants |
168 (32.6%) |
256 (33.3%) |
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| 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%) |
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| Short or middle length advanced studies (1 to 4 years) |
156 (30.3%) |
265 (34.5%) |
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| Long advanced studies (>4 years) |
32 (6.2%) |
90 (11.7%) |
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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 |
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