Systemic sclerosis & Raynaud's
Evaluation of Measurement Properties and Differential Item Functioning in the English and French Versions of the University of California, Los Angeles, Loneliness Scale‐6: A Scleroderma Patient‐Centered Intervention Network (SPIN) Study
Authors' conclusion
Analyses demonstrated evidence of acceptable reliability and validity of ULS-6 scores in English- and French-speaking adults with SSc. DIF analysis supported use of the ULS-6 to examine comparative experiences of loneliness without adjusting for language.
Study context
- Population
- Adults with systemic sclerosis (SSc) enrolled in the SPIN COVID-19 Cohort, during the COVID-19 pandemic
- Participants
- 775 adults
- Exposure
- English vs French versions of the ULS-6
- Outcome
- Psychometric properties (reliability, validity, DIF across language) of the ULS-6
- Follow-up
- Baseline
Methodological detailspsychometric evaluation, confirmatory factor analysis, differential item functioning (multiple-indicator multiple-cause (MIMIC) model), SPIN COVID-19 Cohort baseline data
- Psychometric evaluation
- Confirmatory factor analysis
- Differential item functioning (MIMIC model)
- SPIN COVID-19 Cohort baseline data
Main finding
As reported in the abstract
Psychometric properties of ULS-6 scores (CFA, DIF across language via MIMIC model)
- Confirmatory factor analysis (CFA), total sample: single-factor structure supported, comparative fit index (CFI)
- 0.96
- CFA, total sample: standardized root mean residual (SRMR)
- 0.03
- Standardized factor loadings for items (all large)
- 0.60-0.86
- Overall MIMIC model with language as covariate (fit well): CFI
- 0.94
- Overall MIMIC model: SRMR
- 0.04
- Overall MIMIC model: root mean square error of approximation
- 0.11
- Statistically significant differential item functioning (DIF) across language, item 2
- βitem2 = 0.14, P < 0.001
- Statistically significant DIF across language, item 4
- βitem4 = −0.07, P = 0.01
- Statistically significant DIF across language, item 6
- βitem6 = 0.13, P < 0.001
Observational data: associations, not effects.
Original publication
Evaluation of Measurement Properties and Differential Item Functioning in the English and French Versions of the University of California, Los Angeles, Loneliness Scale‐6: A Scleroderma Patient‐Centered Intervention Network (SPIN) Study. Arthritis Care Res (Hoboken). Published 26 April 2023. doi:10.
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