Table 1

Enterobacterial antibody concentrations in jejunal perfusion fluids of patients with ankylosing spondylitis (AS), rheumatoid arthritis (RA), and healthy controls

Antibodies against	Patients with AS (n=19) mean (SD)	Patients with RA (n=22) mean (SD)	Healthy controls (n=22) mean (SD)
K pneumoniae27736
IgM	0.256 (0.185)^A	0.288 (0.204)^B	0.149 (0.075)
IgA	0.572 (0.360)^D,G	0.271 (0.201)	0.227 (0.209)
IgG	0.148 (0.268)	0.083 (0.100)	0.123 (0.088)
K pneumoniae43
IgM	0.077 (0.064)^D	0.053 (0.054)^B	0.017 (0.021)
IgA	0.160 (0.146)^C	0.082 (0.078)	0.060 (0.044)
IgG	0.016 (0.043)^B,F	−0.016 (0.036)	−0.014 (0.022)
K pneumoniae21
IgM	0.129 (0.188)^A	0.167 (0.109)^E	0.032 (0.042)
IgA	0.261 (0.155)^D,F	0.134 (0.122)	0.122 (0.087)
IgG	0.116 (0.054)^E,I	0.028 (0.049)	0.015 (0.037)
E coli
IgM	0.263 (0.217)^C	0.205 (0.234)	0.108 (0.072)
IgA	0.551 (0.329)^C	0.374 (0.269)	0.304 (0.167)
IgG	0.055 (0.056)	0.043 (0.037)	0.068 (0.055)
Proteus mirabilis
IgM	0.086 (0.088)^A	0.103 (0.088)^C	0.037 (0.036)
IgA	0.312 (0.249)^A	0.266 (0.209)	0.177 (0.114)
IgG	0.031 (0.038)	0.036 (0.040)	0.029 (0.026)

Mean (SD) of the absorbance values at wavelength 405 nm are given. n, Number of patients. p≤0.05^A, 0.01^B, 0.005^C, 0.001^D, 0.0001^E, when compared with healthy controls. p≤0.05^F, 0.01^G, 0.005^H, 0.0001^I when compared with rheumatoid arthritis.