Construct validity analysis by correlation between ScleroID and other established PROMs
| Variable | Pearson correlation coefficient* |
| Physician’s Global Assessment | 0.28 (0.05) |
| Patient’s Global Assessment | 0.77 (0.03) |
| SF-36 Physical Component Score | −0.62 (0.03) |
| SF-36 Mental Component Score | −0.47 (0.03) |
| HAQ-DI | 0.62 (0.03) |
| SSc-HAQ | 0.73 (0.02) |
| EQ-5D (UK-weighted) | −0.48 (0.04) |
| VAS-GIT | 0.38 (0.05) |
| VAS-Dyspnoea | 0.38 (0.04) |
| VAS-Raynaud | 0.42 (0.04) |
| VAS-Ulcers | 0.37 (0.05) |
*Bootstrap standard errors (SEs) of estimated correlation given in brackets.
EQ-5D, EuroQol Five Dimensional Questionnaire; GIT, gastrointestinal tract; HAQ-DI, Health Assessment Questionnaire Disability Index; PROMs, patient-reported outcome measures; ScleroID, Systemic Sclerosis Impact of Disease; SF-36, Short Form (36) Health Survey; SSc, systemic sclerosis; VAS, Visual Analogue Scale.