Table 1

Clinical parameters (median and IQR) in relation to a level of high sensitivity C reactive protein (hsCRP) in patients with the level of routine CRP <6 mg/litre

hsCRP (mg/litre)
ASNon-radiographic axial SpA
Parameter0–1.9 (n=40)2.0–3.9 (n=14)≥4.0 (n=11)0–1.9 (n=46)2.0–3.9 (n=12)≥4.0 (n=3)
Fatigue, points NRS4.0 (2.0–7.8)4.5 (3.0–8.0)6.0 (2.0–7.0)5.0 (2.5–7.0)5.0 (3.0–7.0)7.0 (5.0–7.0)
General pain, points NRS4.0 (2.0–5.0)5.0* (3.8–6.3)5.0 (2.0–7.0)5.0 (2.0–7.0)4.5 (2.3–7.0)7.0 (5.0–8.0)
Spinal pain, points NRS3.5 (2.0–6.0)6.0* (3.8–7.3)5.0 (4.0–8.0)5.5 (2.0–7.0)5.5 (1.5–7.8)6.0 (6.0–8.0)
Night back pain, points NRS2.0 (1.0–5.0)4.5* (3.0–6.3)7.0* (3.0–7.0)4.5 (2.0–7.0)5.0 (0.8–7.8)8.0 (5.0–10.0)
Peripheral joint pain, points NRS1.0 (0–4.8)1.0 (0–5.0)1.0 (0–5.0)1.0 (0–4.3)4.0 (0–5.8)7.0 (3.0–7.0)
Local tenderness, points NRS1.0 (0–4.0)4.0 (1.5–5.0)3.0 (0–5.0)2.0 (0–4.5)3.0 (1.0–6.0)2.0 (2.0–2.0)
Morning stiffness, points NRS3.0 (1.0–5.8)5.5 (2.8–7.0)5.0 (2.0–8.0)4.0 (1.0–7.3)2.0 (1.0–6.0)6.0 (5.0–7.0)
BASDAI2.8 (1.4–5.5)3.9 (2.8–5.9)3.6 (1.7–5.7)3.6 (1.4–5.0)4.7 (2.0–5.3)3.6 (1.7–5.7)
BASFI1.3 (0.2–4.7)2.5 (1.4–3.7)3.0 (1.0–5.9)1.3 (0.3–3.7)2.7 (1.1–4.3)4.7 (4.0–5.4)
BASMI1.0 (1.0–2.8)1.0 (0–1.0)1.0 (1.0–3.0)1.0 (0–2.0)1.0 (1.0–2.0)2.0 (0–2.0)
  • * p<0.05 in comparison to the first tertile (level of hsCRP 0–1.9 mg/litre).

  • AS, ankylosing spondylitis; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Functional Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; NRS, numerical rating scale; SpA, spondyloarthritis.