Table 1 Characteristics of the subjects

Age when diagnosis was made (yr)

35.3 ± 12.5

42.5 ± 13.4

0.128

Age of symptom onset (yr)

33.2 ± 13.5

34.2 ± 13.4

0.945

Body mass index (BMI)

24.2 ± 4.5

23.8 ± 1.4

0.905

Gender ratio (M:F)

12:8

4:9

0.157

HLA-B27 (+)

10/20

0/13

0.002*

Peripheral arthritis (+)

10/20

0/13

0.002*

Enthesitis (+)

3/20

0/13

0.261

Uveitis (+)

1/20

0/13

1.000

Family history of SpA (+)

2/20

0/13

0.507

ESR (mm/h)

27.9 ± 7.0

10.5 ± 3.2

0.032*

CRP (mg/L)

1.7 ± 0.6

0.2 ± 0.1

0.004*