Baseline characteristics
| RA (n=474) | PsA (n=501) | AS (n=483) | |
| Demographics | |||
| Age, years | 54.9±13.4 | 50.5±12.1 | 43.6±12.3 |
| Range | 19–82 | 18–83 | 18–73 |
| Males, % | 27.2 | 45.9 | 66.5 |
| Time since first diagnosis, years | 10.4±8.9 | 13.0±11.5 | 9.8±9.4 |
| Mean BMI, kg/m2 | 26.5±4.9 | 28.1±5.4 | 26.7±5.5 |
| Laboratory and pretreatment | |||
| CRP, mg/L | 16.4±33.1 | 13.6±48.0 | 19.8±49.5 |
| ESR, mm/h | 28.4±22.2 | 22.8±20.1 | 24.9±20.9 |
| Biologic-naïve, % | 64.7 | 56.5 | 61.0 |
| Employment status | |||
| Full time, % | 32.6 | 45.1 | 62.1 |
| Part time, % | 13.1 | 10.6 | 7.5 |
| Unemployed, % | 5.1 | 10.0 | 10.8 |
| Housewife/houseman, % | 10.8 | 6.0 | 3.3 |
| Pupil/student/ in apprenticeship, % | 1.9 | 3.0 | 2.3 |
| Early pension, % | 6.1 | 9.2 | 4.4 |
| Old-age pension, % | 27.1 | 12.6 | 6.0 |
| Handicapped (unable to work in his/her profession or work at all), % | 3.2 | 3.4 | 3.5 |
Values are presented as mean ±SD or percentages.
AS, ankylosing spondylitis; BMI, body mass index; CRP, C reactive protein; ESR, erythrocyte sedimentation rate; PsA, psoriatic arthritis; RA, rheumatoid arthritis.