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Association between septal deviation and OSA diagnoses: a nationwide 9-year follow-up cohort study

The prevalence of OSA was significantly higher in the SD group compared with the control group. This result was more pronounced as the BMI increased and decreased significantly after septoplasty. The nose is the first and major route that air passes through on its way to the lungs. Laminar airflow is necessary in both nostrils to benefit from wearing a positive pressure device. Nasal congestion is a factor that adversely affects air passage, and surgery to improve nasal congestion (for example, septoplasty) lowers nasal resistance and increases CPAP adherence.

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