Nasal Expiratory Positive Airway Pressure Devices (Provent) for OSA: A Systematic Review and Meta-Analysis

Figure 3

Pre- and post-nasal EPAP therapy outcomes for apnea-hypopnea index (events per hour), standardized mean difference. SD: standard deviation; CI: confidence interval; nasal EPAP device: nasal expiratory positive airway pressure device (Provent).