title: Behavioral Factors Related to Sleep Quality and Duration in Adults.
abstract: BACKGROUND
  The purpose of this study was to measure the sleep quality and duration in healthy adults and to identify any influencing factors.
  
  
  METHODS
  This study was a descriptive research investigation that evaluated 240 healthy adults at least 19 years of age. The data were assessed using the following self-administered questionnaires: the Pittsburgh Sleep Quality Index (PSQI), the Beck Depression Inventory, the State-Trait Anxiety Inventory-Korean YZ, and the Fatigue Severity Scale.
  
  
  RESULTS
  The PSQI global score was 5.69 ± 3.23, and 59.6% of the participants were classified as having poor quality sleep (PSQI score > 5). The significant risk factors for poor sleep quality were female gender (p = 0.021), number of comorbid conditions (p = 0.003), depression (p < 0.001), fatigue (p < 0.001), and anxiety (p < 0.001). Stepwise multiple regression analyses showed that significant predictors of poor sleep quality were depression (p < 0.001) and fatigue (p < 0.001). Participants slept an average of 6.16 ± 1.36 hours a night. A shorter sleep duration was correlated with older age (p = 0.010), a higher body mass index (BMI) (p = 0.026), a greater depression score (p = 0.002), a higher fatigue score (p = 0.028), and lower sleep quality (p < 0.001). In addition, stepwise multiple regression analyses revealed that factors significantly associated with sleep duration were depression (p = 0.002) and BMI (p = 0.034).
  
  
  CONCLUSIONS
  The number of comorbid conditions and the presence of depression and fatigue were risk factors for both low sleep quality and short sleep duration. Therefore, to improve sleep quality, there is a need for comprehensive interventional programs to manage these and any other factors that disturb sleep.
authors.affiliation: College of Nursing, Seoul National University, Seoul, Korea.
authors.forename: Joohee
authors.initials: J
authors.lastname: Shim
authors.affiliation: College of Nursing, Seoul National University, Seoul, Korea; The Research Institute of Nursing Science, Seoul National University, Seoul, Korea.
authors.forename: Seung Wan
authors.initials: SW
authors.lastname: Kang
keywords: Adult; Anxiety; Depression; Fatigue; Sleep