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The Sleep Disorders Questionnaire. I: Creation and multivariate structure of SDQ
A B Douglass1, R Bornstein, G Nino-Murcia
1Ann Arbor VA Medical Center Psychiatry Service, Michigan.
Sleep
|March 1, 1994
Summary
The Sleep Disorders Questionnaire (SDQ) was developed for better sleep disorder diagnosis. New scales for sleep apnea and narcolepsy show the most promise for accurate identification of sleep conditions.
Area of Science:
- Medical research
- Psychometrics
- Sleep medicine
Background:
- The Sleep Questionnaire and Assessment of Wakefulness (SQAW) was previously used.
- Item extraction and rewording were performed to improve completion rates.
Purpose of the Study:
- To describe the development of the Sleep Disorders Questionnaire (SDQ).
- To establish reliable and valid clinical-diagnostic scales for sleep disorders.
Main Methods:
- Test-retest reliability studies were conducted on controls and patients.
- Multicenter study with 519 participants, including 435 sleep disorder patients with polysomnography.
- Canonical Discriminant Function Analysis and Receiver Operating Characteristics analysis were used.
Main Results:
- Two item test-retest reliability studies confirmed adequate reliability.
- Four clinical-diagnostic scales were developed: Sleep Apnea (SA), Narcolepsy (NAR), Psychiatric Sleep Disorder (PSY), and Periodic Limb Movement Disorder (PLM).
- SA and NAR scales demonstrated the most significant discriminating power.
Conclusions:
- The developed SDQ and its scales provide a reliable and valid tool for diagnosing sleep disorders.
- The SA and NAR scales are particularly effective in differentiating these sleep conditions.
- Further validation and application of the SDQ in clinical practice are recommended.