The percentage of SRC cases with multiple risk factors from Table 4 present at SSc diagnosis compared to the SSc without SRC disease controls. Data are %, n/N.
| No. Variables Present | SRC, n = 31 | SSc without SRC, n = 322 |
|---|---|---|
| ≥ 2 | 94, 29/31 | 16, 51/322 |
| ≥ 3 | 77, 24/31 | 3, 11/322 |
| ≥ 4 | 66, 20/31 | 0, 0/322 |
All p values < 0.001. SRC: scleroderma renal crisis; SSc: systemic sclerosis.