Number of arteries affected per person, according the ankle-brachial index
| No of affected arteries | Incompressible (ABI >1.3) | Normal (ABI >0.9 to 1.3) | Obstructed (ABI ⩽0.9) | |||
|---|---|---|---|---|---|---|
| RA (n = 234) | Control (n = 102) | RA (n = 234) | Control (n = 102) | RA (n = 234) | Control (n = 102) | |
| Values are n (%) unless stated otherwise. | ||||||
| ABI, ankle-brachial index; RA, rheumatoid arthritis. | ||||||
| 4 | 8 (3) | 0 | 188 (80) | 97 (95) | 4 (2) | 0 |
| 3 | 3 (1) | 0 | 21(9) | 3 (3) | 1 (<1) | 0 |
| 2 | 5 (2) | 1 (1) | 7 (3) | 2 (2) | 1 (<1) | 1 (1) |
| 1 | 15 (6) | 1 (1) | 4 (2) | 0 | 9 (4) | 2 (2) |
| 0 | 203 (87) | 100 (98) | 13 (6) | 0 | 219 (94) | 99 (97) |
| Total arteries (n) | 66 | 3 | 835 | 401 | 30 | 4 |
| χ2 Value | 10.7 with 4 degrees of freedom | 13.5 with 4 degrees of freedom | 2.8 with 4 degrees of freedom | |||
| p Value | 0.03 | 0.009 | 0.6 | |||