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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