From:  The asthma-obstructive sleep apnea overlap: pathophysiological links, clinical impact, and implications for integrated management

 Selected key studies evaluating the association between asthma and OSA.

Author (Year) (Ref.)Study designPopulation & sample size (N)OSA diagnostic methodMain visualized & clinical outcomesQuality & methodological limitations
Julien et al. (2009) [5]Case-control78 adult patientsFull in-laboratory PSGHigher prevalence and severity of OSA in severe asthma vs. controls.High diagnostic accuracy; small sample size; single-center setting.
Teodorescu et al. (2010) [7]Cross-sectional472 adult asthma patientsValidated risk questionnairesOSA risk significantly associated with poor asthma control scores.High clinical utility; subject to recall bias; lacks objective PSG confirmation.
Teodorescu et al. (2015) [4]Population-based cohort547 adult patients (longitudinal)Serial full PSG over timeBaseline asthma significantly predicts incident OSA development.Strong longitudinal design; well-controlled for major baseline confounders.
Kauppi et al. (2016) [6]Longitudinal follow-up197 asthma patientsClinical tracking and PSGBaseline asthma severity correlates with accelerated OSA development.Excellent real-world data; limited by varying follow-up intervals.
Kong et al. (2017) [3]Systematic review & meta-analysis7,675 adult patientsMixed (PSG and questionnaires)Confirmed that asthma is associated with a significantly increased risk of OSA.High statistical power; significant heterogeneity across pooled studies.
Lafond et al. (2007) [55]Interventional trial20 comorbid patientsPSG pre- and post-treatmentCPAP therapy significantly improves asthma symptoms and quality of life.Objective proof of concept; unblinded; lacks a placebo/sham-CPAP control arm.

OSA: obstructive sleep apnea; PSG: polysomnography; CPAP: continuous positive airway pressure.