Table 2

 Ankle-brachial index in rheumatoid arthritis and control arteries

Ankle-brachial indexRA (931 arteries)Controls (408 arteries)OR (95% CI)p Value*
*p Values were calculated using robust standard errors, adjusted for within-person correlation of arterial measurements.23
CI, confidence interval; n/a, not applicable; OR, odds ratio.
Mean (SD)1.11 (0.20)1.11 (0.08)n/aNS
>1.3 (incompressibility) (n(%))66 (7)3 (0.7)10.57 (2.31 to 48.3)0.002
>0.9 to 1.3 (normal) (n (%))835 (90)401 (98)1.00 (referent)
⩽0.9 (obstruction) (n (%))30 (3)4 (1)3.60 (0.94 to 13.8)0.06