Background The Pittsburgh Sleep Quality Index (PSQI) is a widely used self-report
questionnaire that measures general sleep quality in general populations. However, its
psychometric properties have yet to be thoroughly examined in longevous persons.
Objectives This study aimed to explore the reliability, validity and factor structure of the
Chinese-language version of the PSQI in community-dwelling centenarians. Methods A total
of 958 centenarians (mean age= 102.8 years; 81.8% females) recruited from 18 regions in …