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Positional obstructive sleep apnea is highly prevalent and associated with lower BMI and a more favorable sleep and oxygenation profile independent of AHI.

Among 12,036 OSA patients, 66.3% had positional OSA (POSA) and 27.8% had supine-exclusive POSA. POSA patients had lower AHI (24.1 vs. 44.4 events/h), lower BMI (29.2 vs. 31.4 kg/m²), and were slightly younger than non-POSA patients, with differences more pronounced at lower AHI levels.

Last updated: Jul 13, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Analysis of positional obstructive sleep apnea features in 12,000 patients at a sleep center.

observational

Rosa CFA, Chillcce KAS, Cahali MB, Boldt MS, Soares VHD, Rosa OA, Passos PHV, Alves MRS, Minniti EGO, Rodrigues JE, Ribas GRW · Sleep & breathing = Schlaf & Atmung (2026)

Participants: N/A
Duration: 6 years (September 2017–August 2023)
Intervention: Classification of OSA patients as POSA or non-POSA based on supine vs. non-supine AHI ratio.
Outcome: Prevalence of POSA, AHI, BMI, sleep architecture (sleep efficiency, N3 proportion, REM latency), oxygenation (mean SpO₂, T90), and arousal index.
Effect Size: N/A
Population: 12,036 patients with obstructive sleep apnea undergoing polysomnography at a sleep center (September 2017–August 2023).

Result:

PubMed: 42400703DOI: 10.1007/s11325-026-03755-3

Mechanism Graph

Positional dependency leads to lower overall AHI
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Lower AHI is associated with better sleep efficiency and oxygenation
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These differences are attenuated in severe OSA
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Result: POSA represents a distinct phenotype with milder disease

Limitations

  • ⚠Retrospective design limits causal inference
  • ⚠Single-center study may limit generalizability
  • ⚠No adjustment for potential confounders like comorbidities or medication use

Frequently Asked Questions

What is the prevalence of positional OSA in this study?▼

66.3% of the 12,036 OSA patients had positional OSA, with 27.8% having supine-exclusive POSA.

How does POSA differ from non-POSA in terms of BMI?▼

POSA patients had a lower mean BMI (29.2 kg/m²) compared to non-POSA patients (31.4 kg/m²).

Is there a sex difference in POSA?▼

No sex differences were observed for POSA overall, but supine-exclusive POSA was more frequent in women.

Does the severity of OSA affect the characteristics of POSA?▼

Yes, differences between POSA and non-POSA were more pronounced at lower AHI levels and diminished with increasing severity.

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References

  1. 1.Rosa CFA, Chillcce KAS, Cahali MB, Boldt MS, Soares VHD, Rosa OA, Passos PHV, Alves MRS, Minniti EGO, Rodrigues JE, Ribas GRW. "Analysis of positional obstructive sleep apnea features in 12,000 patients at a sleep center.." Sleep & breathing = Schlaf & Atmung, 2026. PMID: 42400703 DOI: 10.1007/s11325-026-03755-3
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.