Table 6

Construct validity analysis by correlation between ScleroID and other established PROMs

VariablePearson correlation coefficient*
Physician’s Global Assessment0.28 (0.05)
Patient’s Global Assessment0.77 (0.03)
SF-36 Physical Component Score−0.62 (0.03)
SF-36 Mental Component Score−0.47 (0.03)
HAQ-DI0.62 (0.03)
SSc-HAQ0.73 (0.02)
EQ-5D (UK-weighted)−0.48 (0.04)
VAS-GIT0.38 (0.05)
VAS-Dyspnoea0.38 (0.04)
VAS-Raynaud0.42 (0.04)
VAS-Ulcers0.37 (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.