Table 1
All Patients0–5 drugs6–9 drugs>10 drugs
PP count excluding DMARDs
N=15,004n=7,115n=6,019n=1,870
Baseline characteristics
 Mean Age in years56.354.057.661.0
 Mean DAS 28 (SD)4.30 (1.76)4.17 (1.79)4.51 (1.67)4.88 (1.67)
 Mean HAQ (SD)1.93 (0.64)1.85 (0.65)2.10 (0.56)2.15 (0.58)
 Mean Disease Duration (SD) in years12.59 (9.72)11.96 (9.32)13.79 (10.26)14.67 (10.96)
 Comorbidity (SD)1.87 (0.80)1.65 (0.74)2.29 (0.73)2.57 (0.68)
Analysis of Serious Adverse Events
 Exposure time (person-years)14,2009,6903,706804
 Event count (single failure model)326120021251368
 Incidence rate (95% CI)25.5 (24.7–26.3)20.6 (19.7–21.5)33.7 (31.9–35.6)45.7 (41.3–50.7)
Including DMARDs in PP model
 Unadjusted HR (95% CI)Ref1.20 (1.11–1.29)1.82 (1.66–1.99)
 Adjusted HR (95% CI)Ref1.05 (0.97–1.13)1.39 (1.26–1.54)
Excluding DMARDs in PP model
 Unadjusted HR (95% CI)Ref1.63 (1.52–1.75)2.21 (1.98–2.47)
 Adjusted HR (95% CI)Ref1.18 (1.09–1.28)1.35 (1.19–1.53)
  • Adjusted for age, sex, DAS, HAQ, disease duration and comorbidities.