Mean brachial and finger systolic pressure measurements (mm Hg), and ratio of finger:brachial in 18 patients with primary Raynaud's phenomenon, 14 patients with secondary Raynaud's phenomenon, and their matched control subjects. Local finger temperature was 32°C. Values are mean (SD)
| Primary | Controls | Secondary | Controls | |
| Brachial systolic | 119 (10.7) | 112 (12.2) | 111 (11.5) | 116 (12.1) |
| Range | 98–130 | 95–135 | 98–130 | 100–130 |
| Finger systolic | 93 (18.8)4-150 | 108 (15.5) | 84 (18.9)4-165 | 112 (13.8) |
| Range | 62–125 | 82–141 | 61–111 | 88–132 |
| Ratio | 0.78 (0.16)4-160 | 0.96 (0.07) | 0.76 (0.15)4-165 | 0.97 (0.06) |
| Range | 0.54–1.05 | 0.87–1.1 | 0.47–0.94 | 0.84–1.1 |