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Psychometric properties of an insomnia-specific measure of worry: The Anxiety and Preoccupation about Sleep Questionnaire

  • Marcus Jansson-Fröjmark
  • Allison Harvey
  • Lars-Gunnar Lundh
  • Annika Norell-Clarke
  • Steven Linton
Publiceringsår: 2011
Språk: Engelska
Sidor: 65-76
Publikation/Tidskrift/Serie: Cognitive Behaviour Therapy
Volym: 40
Dokumenttyp: Artikel i tidskrift
Förlag: Taylor & Francis


The aim of this study was to examine the psychometric properties of the Anxiety and Preoccupation about Sleep Questionnaire (APSQ), with a focus on factorial validity and internal consistency as well as discriminative, convergent, and association with sleep parameters and daytime impairment. Among a randomly selected sample from the general population (N = 5,000), 2,333 participants completed a survey on nighttime symptoms, daytime symptoms, health outcomes, and psychological processes. The study sample consisted of 1800 participants who did not fulfill criteria for another sleep disorder than insomnia. A two-factor solution, accounting for 70.7% of the variance, was extracted from the 10 APSQ items. One six-item factor determined worries about the consequences of poor sleep (a = .91); the second factor, with four items, assessed worries about the uncontrollability of sleep (a = .86). The two factors were significantly intercorrelated (r = .65)and significantly associated with the total APSQ (rs = .97 and .76, respectively). The APSQ and the two subscales showed discriminant validity between three sleep status groups (normal sleep, poor sleep, and insomnia disorder; R2 = .33–.41). The APSQ and the subscales demonstrated convergent

validity with measures on cognitive arousal, sleep-related beliefs, anxiety, and depression. They also were significantly correlated with sleep parameters and daytime impairment. The findings suggest that the APSQ is a psychometrically sound instrument for assessing worry in insomnia.


  • Psychology


  • ISSN: 1651-2316

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