Table 1

Baseline characteristics of the biological-naïve and biological-exposed cohorts of patients with RA and matched individuals from the general population 2002–2011

General population comparators (n=175 972)Biological-naïve RA (n=37 982)Biological-exposed RA (n=10 800)
Female, %71.771.475.6
Age at start of follow-up, mean (±SD)62.7±13.963.1±14.156.4±13.3
Years follow-up, mean (±SD)7.0±3.05.9±3.24.5±2.8
Country of birth
 Born in Nordic country, %93.495.390.6
 Born in Europe (non-Nordic), %
 Born outside of Europe, %
 Cancer, %13.213.610.9
 Diabetes, %
 COPD, %
 9 years or less37.541.526.9
 10–12 years39.338.844.3
 >12 years21.717.526.2
  • *History of each comorbidity defined as any international classification of diseases code for each diagnosis before start of follow-up.

  • RA, rheumatoid arthritis; COPD chronic obstructive pulmonary disease.