Validation of the three-factor model of the PSQI in a large sample of chronic fatigue syndrome (CFS) patients

Examining the role of psychological need satisfaction in sleep: A Self-Determination Theory perspective

“…Three distinct factors representing poor sleep quality, sleep quantity, and daytime dysfunction were found. This finding is in line with previous studies which identified a 3-factor model of the PSQI as a better fit than a single-factor model in both clinical and non-clinical samples (e.g., Mariman et al, 2012). However, in contrast to previous studies we examined additional parameters in addition to the PSQI, each of which yielded a satisfactory loading onto one of the three factors.…”

“…We deemed the inclusion of a positive indicator such as vitality, which has received quite a lot of attention within positive psychology (Ryan & Fredericks, 1997), critical as to move away from a focus on fatigue by including positive indicators of energy. Overall, the separation of the PSQI into three distinct factors underscores the claim from previous studies that the global PSQI has limited usefulness as a single factor (Mariman et al, 2012). Indeed, a more heterogeneous approach involves the recognition that sleep and day-related parameters can be distinguished and that, in turn, sleep outcomes can be differentiated into more refined categories.…”

The Pittsburgh sleep quality index as a screening tool for sleep dysfunction in clinical and non-clinical samples: A systematic review and meta-analysis

“…The samples represented a variety of clinical disorders, including cancer [35,36,50,72], schizophrenia, and chronic fatigue syndrome [63,68], as well as healthy participants of varying ages [40,41,49,51], sexes [46e80], and races and ethnicities [49,78].…”

Quality of Sleep at the Ward after Cardiothoracic Surgery

“…The Pittsburgh Sleep Quality Index (PSQI) is a validated questionnaire and investigates different aspects of sleep: the duration of sleep, sleep disturbance, sleep latency, day dysfunction due to sleepiness, sleep efficiency, overall sleep quality and use of sleeping medication [12] [13]. There are also questions for the partner of the patient, but these are not mandatory for obtaining a score.…”