Reliability Generalization of Scales in Sleep Medicine: An Umbrella Review and Meta-Analysis of Meta-Analyses

Study Information Objective: To synthesize reliability evidence (e.g., internal consistency, test-retest, inter-rater) for sleep assessment scales across diverse populations and clinical contexts, identify moderators of variability, and highlight gaps in existing literature. Key Features of Included Scales: Common Scales: Pittsburgh Sleep Quality Index (PSQI), Epworth Sleepiness Scale (ESS), Insomnia Severity Index (ISI), Berlin Questionnaire (BQ), STOP-Bang. Reliability Metrics: Cronbach’s α, intraclass correlation coefficients (ICCs), kappa statistics. Populations: Adults, pediatric/geriatric groups, neurological/psychiatric patients, cross-cultural adaptations.