Confirmatory factor analysis of the Pittsburgh Sleep Quality Index in rheumatoid arthritis patients
Sleep quality in patients with fibromyalgia using the Pittsburgh Sleep Quality Index
Measures of Sleep in Rheumatologic Diseases: Sleep Quality PatientāReported Outcomes in Rheumatologic Diseases
Validation of the Portuguese version of the Pittsburgh Sleep Quality Index (PSQI-PT)
https://pubmed.ncbi.nlm.nih.gov/27923147/Reliability and factorial analysis of the Spanish version of the Pittsburg Sleep Quality Index among psychiatric patients
https://pubmed.ncbi.nlm.nih.gov/19112721/Validity of the Italian version of the Pittsburgh Sleep Quality Index (PSQI)
https://pubmed.ncbi.nlm.nih.gov/22526760/