| MEASUREMENT PROPERTIES | |
| Limitations | >=5 European languages (English) |
| Observations | |
| 1. RELIABILITY | |
| A. Internal Consistency | Tested |
| Cronbach's (Describe) |
Child report: 0.9 for total, 0.8 for effect on self, 0.8 for limitations, 0.7 for social, and 0.8 for burden of SLE for child report. Parent report: 0.9 for total, 0.9 for effect on self, 0.9 for limitations,0.6 for social, and 0.9 for burden of SLE |
| B. Reliability intraobserver or test-retest | Tested |
| Continuous scores: intraclass correlation coefficient (ICC) Dichotomus: Cohen kappa (Describe) |
Test retest reliability: the ICC (0.7– 0.9, P < 0.001) and rho (0.6–0.9, P < 0.001) for the total and domain scores were high for both child and parent reports |
| C. Reliability interobserver or Measurement error | Tested |
| Standard error of measurement (SEM), smallest detectable change (SDC) or Limits of agreement (LoA) (Describe) |
Agreement between child and parent SMILEY reports: moderate rho (0.4–0.6, P < 0.001) and ICC (0.6–0.7, P < 0.001) values |
| 2. VALIDITY | |
| A. Content validity: face validity | Tested |
| Expert opinion (relevance and comprehensiveness) (Describe) |
All the reviewers of SMILEY found it to be valid, relevant, and easy to understand, and especially liked the responses in the form of faces. |
| B. Construct Validity: Structural validity |
Not Tested |
| Hypotheses-testing | Tested |
| Cross-cultural validity | Not Tested |
| Brief Description | |
| C. Criterion validity | Tested |
| Comparison with a 'gold standard' Continuous scores: correlations, ROC curves Dichotomus: Sensitivity & Specificity (Describe) |
The child SMILEY limitation domain (n = 86) correlated mildly with the PGA (rs = 0.3, P = 0.02), SLEDAI total score (rs = 0.2, P = 0.02), and SDI (rs = 0.2, P = 0.03). Total/domain scores of child/parent SMILEY did not correlate significantly with SLEDAI, PGA, SDI, or disease duration. |