Table 4.

Median value of titers in AS patients versus controls and results of Z-testing

Antibody	Median value of titer in AS patients	Median value of titer in control patients	P value
IgA ASCA	1.24	1.10	0.28
IgG ASCA	4.70	4.05	0.29
Anti-I2	11.78	7.86	0.0172
Anti-OmpC	8.61	7.70	0.30
Anti-CBir1	16.26	15.05	0.63
ANCA	11.6	12.1	0.65

The median value of Anti-I2 in AS patients is significantly increased when compared to controls (shown in bold and italics).

ANCA = antineutrophil cytoplasmic antibodies; anti-CBir1 = anti-flagellin; anti-OmpC = anti-Escherichia coli outer membrane porin C; AS = ankylosing spondylitis; ASCA = Anti-Saccharomyces cerevisiae antibody.