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Subgroup analysis for studies in which continuous positive airway pressure (CPAP) was delivered by a nasal mask interface, prenasal and postnasal surgery. The fixed-effects analysis demonstrated a statistically significant decrease in therapeutic CPAP device pressures with a mean difference of −2.81 cwp (95% confidence interval [CI], −3.22 to −2.40; P < 0.00001). SD, standard deviation.
