Pittsburgh Sleep Quality Index
Medicine
Confidence interval
Pandemic
Cross-sectional study
Gerontology
Sleep quality
Multivariate analysis
Coronavirus disease 2019 (COVID-19)
Sleep (system call)
Stress (linguistics)
Demography
Family medicine
Psychology
Clinical psychology
Psychiatry
Internal medicine
Disease
Insomnia
Linguistics
Philosophy
Pathology
Sociology
Computer science
Infectious disease (medical specialty)
Operating system
