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Table 1 Baseline characteristics of 701 patients in early arthritis (EA) and 646 patients in early inflammatory back pain (IBP) patients recruited to observational cohorts

From: Similar alteration for mental and physical aspects in health-related quality of life over 5 to 8 years in 1347 patients with early arthritis and early inflammatory back pain

Characteristics EA population
N = 701
Patients fulfilling RA classification criteria
N = 568
IBP population
N = 646
Patients fulfilling ASAS classification criteria
N = 402
Age (years), mean (SD) 48.4 (12.2) 48.9 (12.0) 33.9 (8.7) 31.7 (7.3)
Symptom duration (month), mean (SD) 3.4 (1.7) 3.3 (1.7) 18.2 (10.8) 18.2 (10.8)
Sex, females, N (%) 535 (76.3) 433 (76.2) 355 (55.0) 197 (49.0)
Studies above high school, N (%) 230 (32.8) 180 (31.7) 391 (60.7) 259 (64.4)
Work status: intermediate/high level employment, N (%) 532 (75.9) 434 (76.4) 494 (77.1) 291 (72.9)
Smoking status, yes, N (%) 326 (46.5) 263 (46.3) 225 (35.0) 152 (37.9)
HAQ, mean (SD) 0.98 (0.69) 1.05 (0.69) 0.67 (0.51) 0.57 (0.49)
DAS28-ESR/ASDAS-CRP, mean (SD) 5.12 (1.30) 5.37 (1.23) 2.62 (0.93) 2.61 (0.99)
SF36-PCS, mean (SD) 38.5 (8.5) 37.8 (8.3) 40.2 (9.1) 40.6 (9.0)
SF36-MCS, mean (SD) 39.8 (10.9) 39.5 (10.7) 40.4 (11.2) 41.0(11.4)
  1. DAS28-ESR was applied to EA and ASDAS-CRP was applied to early IBP. All percentages are calculated on available data
  2. HAQ Health Assessment Questionnaire Disability Index, DAS-28-ESR Disease Activity Score—erythrocyte sedimentation rate, ASDAS-CRP Ankylosing Spondylitis Disease Activity ScoreC reactive protein, PCS physical composite score, MCS mental composite score