The PSQI, which was used to screen potential participants for insomnia, includes 19 self-reported items and uses an algorithm to derive a global score from components of sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbance, use of sleeping medication and daytime functioning [23].
![[This page as RDF]](http://data.gesis.org/somesci/static/rdf-icon.gif){kind=icon}