VALIDATION DATA

1. RELIABILITY
A. Internal Consistency	Tested
Cronbach's (Describe)	Cronbach’s α= 0.72-0.94
B. Reliability intraobserver or test-retest	Tested
Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe)	ICC= 0.55-0.92
C. Reliability interobserver or Measurement error	Not Tested
Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe)

2. VALIDITY
A. Content validity: face validity	Tested
Expert opinion (relevance and comprehensiveness) (Describe)	Item pool for LupusPRO was derived from patient interviews. The interviews and item pool generation were guided by a medical literature review on SLE and HRQOL/QOL, psychosocial literature in SLE, existing HRQOL/QOL tools, and input from clinicians with backgrounds in lupus/rheumatology and psychology.
B. Construct Validity: Structural validity	Tested
Hypotheses-testing	Tested
Cross-cultural validity	Not Tested
Brief Description	On principal component analysis (HRQOL items), 6 loadings were observed. Lupus symptoms and cognition items loaded together, whereas physical health and pain-vitality items loaded together. The 6 domains (eigenvalue > 1) explained 72% of the cumulative variance. Similarly, non-HRQOL items loaded on 3 domains and explained 73% of the cumulative variance. Coping and social support domains loaded together.
C. Criterion validity	Tested
Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe)	To evaluate criterion validity it was performed correlations of LupusPRO domains and HRQOL score with disease activity and damage measures. Correlation between lupus symptoms domain and disease activity measures ranged from -0.23 to -0.47; correlation of HRQOL score with disease activity measures ranged from -0.29 to -0.32 (see table 2 in the paper for more details)