Table 1– Characteristics of patients with lung disease directly associated with rheumatoid arthritis (RA-LD)
Age yrs65.2±9.8 (34–88)
Smoking status
Smoking history pack-yrs16.6±28.1 (0–120)
Age at rheumatoid arthritis onset yrs55.4±14.5 (18–82)
Age at RA-LD onset yrs65.2±9.8 (34–88)
Duration of rheumatoid arthritis yrs9.7±12.0 (-15–57)
Combined disease
 Two diseases
 Three diseases
  • Data are presented as mean±sd (range) or n. UIP: usual interstitial pneumonia; OP: organising pneumonia; NSIP: nonspecific interstitial pneumonia.