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Table 2 Baseline characteristics of the test-retest population

From: Psychometric properties of the painDETECT questionnaire in rheumatoid arthritis, psoriatic arthritis and spondyloarthritis: Rasch analysis and test-retest reliability

  RA PsA SpA p-value
(n = 10) (n = 10) (n = 10)
Female sex n (%) 8 (80) 5 (50) 4 (40) 0.266
Age (years) 65 (62–68) 58.5 (49–67) 47 (32–52) 0.005a
Duration (years) 15.5 (8–24) 8.5 (5–14) 4 (2–6) 0.017b
DMARD n (%) 9 (90) 9 (90) 2(20) 0.003
Biologics n (%) 6 (60) 7 (70) 8(80) 0.879
DAS28-CRP 3.9 (3.7–4.2) 3.7 (3.1–4.4) - 0.519
TJC 28 5.5 (4–10) 6 (2–9) - 0.791
SJC 28 1 (1–4) 0 (0–0) - 0.020
BASDAI (0–100) - 67 (34–83) 28 (14–43) 0.364
BASFI (0–100) - 60.5 (37–89) 18 (13–32) 0.212
ASDAS - 3.05 (2.4–3.8) 2.1 (1.1–2.7) 0.104
VAS pain mm 43 (26–53) 61.5(25–73) 24.5 (19–41) 0.331
VAS fatigue mm 65 (40–79) 63.5 (32–82) 43 (26–67) 0.397
VAS global mm 50 (34–63) 72 (32–87) 29.5 (22–57) 0.219
HAQ 1.25 (0.875–2) - - -
Crp mg/l 5.5 (1–10) 4 (1–8) 3.5 (1–9) 0.939
HLA-B27 n (%) - 2(100)(n = 2) 3(75)(n = 4) 1
IgM-RF n (%) 5(50) - - -
Anti-CCP n (%) 5(50) - - -
  1. Except where indicated otherwise values are the median (interquartile range). P- values are calculated by Kruskal-Wallis or Fishers exact test. asignificant difference between only RA-SpA and SpA-PsA. bsignificant difference between only RA-SpA. DMARD Disease Modifying Anti-Rheumatic Drug, DAS28-crp Disease Activity Score 28 –crp, TJC Tender Joint Count, SJC Swollen Joint Count, BASDAI Bath Ankylosing Spondylitis Disease Activity Index, ASDAS Ankylosing Spondylitis Disease Activity Score, VAS Visual Analogue Scale, HAQ Health Assessment Questionnaire, HLA-B27 Human Leucocyte Antigen-B27, IgM-RF Immunoglobulin M Rheumatoid Factor, Anti-CCP Anti–citrullinated protein antibodies