Table 1 Demographic features of different cohorts

N (male/female)

462 (350/112)

57 (44/13)

52 (26/26)

85 (85/0)

158 (106/52)

HLA-B27 positivity

78% (357/456)

56% (32/57)

0% (0/52)

N/A

0% (0/158)

CRP (mg/L)

13.9 ± 21.1

15.4 ± 17.3

2.13 ± 2.8

N/A

N/A

ESR (mm/hour)

13.5 ± 15.6

14.4 ± 17.2

6.2 ± 4.9

N/A

N/A

BASDAI

4.8 ± 2.5

4.5 ± 2.6

4.8 ± 2

N/A

N/A

Biologics*

43% (200/462)

74% (42/57)

N/A

N/A

N/A

Disease duration (years)

2–62

2–53

N/A

N/A

N/A