Table 1 Characteristic of axSpA patients and healthy blood donor groups

n, (%)

27 (56.25)

23 (43.75)

Age, mean ± SD years

32.9 (7.7)

35.1 (5.4)

0.31

Sex, % male

59.5

52.4

0.61

HLA B27 positive, %

91.7

N/A

Duration of symptoms, median (p25-p75) years

7.5 (5–10)

N/A

IBP, %

88.5

N/A

CRP, median (p25-p75) mg/l

8.8 (2.4–12.9)

0.27 (0.18–0.54)^a)

< 0.0001

ESR, median (p25-p75) mm/h

22.5 (15.0–31.0)

N/A

BASDAI (0–10 scale), median (p25-p75)

2.1 (0.8–4.4)

N/A

ASDAS-CRP median (p25-p75)

2.1 (1.6–3.1)

N/A

mNY x-ray criteria for AS (%)

66.7

N/A

mSASSS median (p25-p75)

3 (0–72)

N/A