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Table 4 Characteristics of 18,485 patients with rheumatoid arthritis at study entry unless otherwise specified

From: The loss of health status in rheumatoid arthritis and the effect of biologic therapy: a longitudinal observational study

Variable Patient Data   Community Norms
  Mean (SD) IQR Range Mean (SD) Range
HAQ 1.06 (0.73) 1.00 (0.50 to 1.62) 0.00 to 3.00   
PCS 35.8 (11.0) 34.7 (27.3 to 44.1) 6.5 to 69.4 46.2 (3.4) 40.2 to 55.3
MCS 49.0 (11.3) 51.4 (40.7 to 58.0) 7.6 to 75.2 50.8 (1.46) 45.0 to 52.7
EQ-5D 0.73 (0.19) 0.78 (0.69 to 0.83) -0.11 to 1.00 0.83 (0.03) 0.79 to 0.93
Age (years) 59.9 (13.0)     
Sex (% male) 23.3     
Non-Hispanic White (%) 89.8     
High school graduate (%) 89.4     
College graduate (%) 26.3     
Income (median $US) 35,000     
RA duration (median IQR) years 9.7 (4.4 to 18.1)     
Study duration (years) 3.7 (3.2)   0.5 to 11.0   
Study duration biologic comparison) (years) 6.1 (3.0)   1.0 to 11.0   
Comorbid conditions (none) (%) 27.2     
Comorbid conditions (1) (%) 27.1     
Comorbid conditions (≥ 2) (%) 45.8     
Satisfied or very satisfied with health (%) 51.5     
MTX (%) 47.8     
MTX (anytime in study) (%) 60.8     
Prednisone (%) 40.5     
Biologic (anytime in study) (%) 44.5     
DMARD use (lifetime) (%) 92.3     
Triple therapy (lifetime) (%) 3.7     
  1. HAQ, Health Assessment Questionnaire; PCS, SF-36 Physical Component Summary; MCS, SF-36 Mental Component Summary; RA, rheumatoid arthritis; MTX, methotrexate; DMARD, Disease-Modifying Anti-Rheumatic Drug; triple therapy, methotrexate (MTX) + hydroxychloroquine (HCQ) + sulfasalazine (SSZ).
  2. Community norms are age and sex-adjusted to the NDB study population.