Table 2

Positivity rates and level of fecal calprotectin in ankylosing spondylitis patients and healthy controls

Ankylosing spondylitis patients (n = 39)

Healthy controls (n = 42)

P value

Fecal calprotectin (μg/g)

42 (16 to 1,085)

17 (16 to 104)

0.0002

Fecal calprotectin positive (positive > 50 μg/g)

16 (41%)

4 (10%)

0.0016

Data presented as mean (range) or number (percentage).

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