Home sleep apnea tests are recommended only for patients at high risk of moderate to severe obstructive sleep apnea (OSA, apnea-hypopnea index [AHI] ≥ 15/h). We evaluated 14 factors known to be associated with OSA and identified sex differences in predictors of moderate to severe OSA.
Retrospective analysis was done on 545 subjects who completed sleep questionnaires and underwent diagnostic polysomnogram at a tertiary sleep center. Univariate and multivariate analysis was conducted separately in males and females to determine which variables were independent predictors of moderate to severe OSA.
Overall, physical traits were stronger predictors in both males and females. For each sex, only 3 variables were found to be independently predictive of moderate to severe OSA. In order of predictive strength, this included body mass index (BMI) ≥ 38 kg/m2 (aOR 5.80, p < 0.001), neck circumference (NC) ≥ 17 in. (aOR 2.52, p = 0.002), and Epworth sleepiness scale (ESS) ≥ 13 (aOR 2.22, p = 0.015) for males and age ≥ 50 years (aOR 4.19, p < 0.001), NC ≥ 14.5 in. (aOR 3.13, p = 0.003), and report of morning headaches (aOR 2.00, p = 0.039) for females. Applying the Bonferroni correction, BMI and NC remained significant for males, and age and NC remained significant for females.
In a subject population referred for sleep evaluation at a tertiary care center only a few variables are independently predictive of moderate to severe OSA, and these variables differed between males and females. Only BMI, NC, and a high ESS were independently predictive of moderate to severe OSA in males, whereas age, NC, and morning headaches were independently predictive in females.
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The authors thank Michael Lutz, Ph.D. for statistical advice, Onyinye Iweala, M.D., Ph.D. for review of the manuscript, and Aatif Husain, M.D. and Rodney Radtke, M.D. for support of the research.
Conflict of interest
The authors declare that they have no conflict of interest.
This study was approved by the Duke University Health System Institutional Review Board. For retrospective chart reviews, formal consent is not required.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Earl, D.E., Lakhani, S.S., Loriaux, D.B. et al. Predictors of moderate to severe obstructive sleep apnea: identification of sex differences. Sleep Breath 23, 1151–1158 (2019). https://doi.org/10.1007/s11325-019-01790-x
- Obstructive sleep apnea
- Body mass index
- Neck circumference