Factors associated with prior or current digital ulcers in a multivariate model. The association of predicted probabilities and observed responses (c criterion) for this model was 0.691.
| Estimator | SE | Wald Chi-square | p | OR | 95% CI | |
|---|---|---|---|---|---|---|
| Age | −0.004 | 0.022 | 0.0258 | 0.87 | 0.996 | 0.954; 1.041 |
| Male | 0.487 | 0.152 | 9.954 | 0.002 | 2.601 | 1.436; 4.710 |
| Duration of SSc | 0.043 | 0.026 | 2.793 | 0.09 | 1.044 | 0.993; 1.098 |
| Never smoker | −0.121 | 0.111 | 1.205 | 0.27 | 0.784 | 0.508; 1.211 |
| DLCO < 60% predicted | 0.326 | 0.228 | 2.049 | 0.15 | 1.385 | 0.886; 2.165 |
| Rodnan score | 0.034 | 0.010 | 10.896 | 0.001 | 1.035 | 1.014; 1.056 |
| Age at first non-RP symptom | −0.017 | 0.022 | 0.634 | 0.426 | 0.983 | 0.942; 1.026 |
DLCO: lung diffusing capacity for carbon monoxide; SE: standard error of the mean; OR: odds ratio; 95% CI: 2-sided 95% confidence interval of the mean; RP: Raynaud’s phenomenon.