Table 1 Comparison of demographic and clinical data for RA patients enrolled in the national database by 88 rheumatological units with those from a sample of nine selected units (unit sample) and those from the osteoporosis module subsample
DemographyNDBUnit sampleOM subsample
No of cases12 28837921066
Age, in years (mean, SD)59.6 (12.9)59.4 (13.1)59.9 (12.2)
Disease duration, in years (mean, SD)10.7 (9.7)10.7 (9.7)11.5 (10.0)
High disease activity* (score 7–10)7%8%8%
High disease severity† (severe, very severe)17%16%15%
Current DMARD therapy82%82%85%
Complementary current drug therapy90%90%93%
Current glucocorticoid therapy, mg/day
Patient-derived data:
    High pain* (score 7–10)26%27%29%
    Poor general health* (score 7–10)24%25%27%
    low functional capacity‡ (HAQ >1.75)23%24%28%
    No of comorbidities (mean, SD)2.2 (2.0)2.3 (2.1)2.4 (2.1)
  • *Numeric rating scale from 0  =  best to 10  =  worst. †Categorical five-point scale “asymptomatic”, “light”, “moderate”, “severe”, “very severe”. ‡Measured by the Funktionsfragebogen Hannover (FFbH), a health assessment questionnaire (HAQ)-like, convertible instrument measuring functional limitation in activities of daily living on a scale from 0 to 100.11 DMARD, disease-modifying antirheumatic drug; NDB, national database; OM, osteoporosis module; RA, rheumatoid arthritis.