Table 3

Demographic data for ankylosing spondylitis patients stratified by fecal calprotectin positivity

Fecal calprotectin cutoff 50 μg/g


Fecal calprotectin positive (n = 16)

Fecal calprotectin negative (n = 23)

P value


Mean age (years)

45

49

0.48

Male, n (%)

14 (88)

18 (78)

0.68

HLA-B27-positive, n (%)

11 (69)

18 (82)

0.71

Mean disease duration (years)

22

22

0.96

Ethnicity (%)

Caucasian

8

74

0.71

Asian

0

13

0.26

Hispanic

19

13

0.67


Matzkies et al. Arthritis Research & Therapy 2012 14:R261   doi:10.1186/ar4106

Open Data