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J Am Board Fam Med. 2012 Jan-Feb;25(1):104-10. doi: 10.3122/jabfm.2012.01.110123.

Is insomnia an independent predictor of obstructive sleep apnea?

Author information

1
Lynn Institute for Healthcare Research, Colorado Springs, CO 80907, USA. rglidewell@lhsi.net

Abstract

INTRODUCTION:

Obstructive sleep apnea (OSA) is a disorder with high prevalence in primary care. However, little research exists on screening for OSA in primary care samples.

METHODS:

One hundred family medicine patients completed standardized symptom and demographic questionnaires and a structured clinical interview for sleep disorders. Two-step logistic regression was performed to determine the independent predictive value of insomnia for clinical identification of OSA. Additional t tests were computed to examine age and sex patterns of insomnia.

RESULTS:

A model including body mass index and daytime sleepiness predicted OSA status (χ(2) = 18.63; P < .001) and explained 27% of the variance in OSA clinical diagnosis. Addition of insomnia scores to the model significantly improved predictive utility (χ(2) = 25.79; P < .001) and explained 36% of the variance in OSA. Insomnia scores were higher for women compared with men (P = .033) and women with OSA compared with women without OSA (P = .007).

CONCLUSIONS:

Inquiry regarding insomnia may improve clinical identification of OSA when screening for OSA in primary care. This finding possibly is unique to the evaluation of OSA in a primary care versus sleep laboratory sample. The predictive utility of insomnia may be specific to women.

PMID:
22218631
DOI:
10.3122/jabfm.2012.01.110123
[Indexed for MEDLINE]
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