A.W. de Weerd
- The validity of the Dutch Sleep Disorders Questionnaire (SDQ).
- Journal of Psychosomatic Research
- Volume | Issue number
- 45 | 6
- Pages (from-to)
- Document type
- Faculty of Social and Behavioural Sciences (FMG)
- Psychology Research Institute (PsyRes)
The Sleep Disorders Questionnaire (SDQ) is a 176-item questionnaire designed to diagnose the presence of common sleep disorders. This study set out to assess the validity of a Dutch translation of the SDQ. 125 physician-referred patients (aged 16-82 yrs) with several sleep complaints and 20 controls filled out the questionnaire. A cluster analysis of these scores revealed the following clusters: healthy, depression, insomnia, narcolepsy, and apnea. The cluster classification proved correct for 67% of the Ss, as determined on the basis of polysomnography. These results show that the Dutch SDQ is a reasonably valid instrument for diagnosing sleep disorders.
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