Reliability and factor analysis of the Epworth Sleepiness Scale
Components of sleep quality and sleep fragmentation in rheumatoid arthritis and osteoarthritis
Measures of Sleep in Rheumatologic Diseases: Sleep Quality PatientāReported Outcomes in Rheumatologic Diseases
Normative values of the Epworth Sleepiness Scale (ESS), derived from a large German sample
https://pubmed.ncbi.nlm.nih.gov/27234595/Validation of the Spanish version of the Epworth Sleepiness Scale in patients with a sleep apnea syndrome
https://pubmed.ncbi.nlm.nih.gov/10596338/Portuguese-language version of the Epworth sleepiness scale: validation for use in Brazil
https://pubmed.ncbi.nlm.nih.gov/19820814/