Medicine
Pandemic
Coronavirus disease 2019 (COVID-19)
Cross-sectional study
Logistic regression
Gerontology
Population
Quality of life (healthcare)
Depression (economics)
Pittsburgh Sleep Quality Index
Demography
Clinical psychology
Environmental health
Disease
Psychiatry
Internal medicine
Sleep quality
Pathology
Infectious disease (medical specialty)
Insomnia
Nursing
Sociology
Economics
Macroeconomics
