The problem with CPAP is that 40% of patients don't tolerate it even for the 4h/night defined as treatment compliance, while most of the rest use it less than the full duration of the night, with studies demonstrating that treatment compliance depends on efficacy.
And this is for traditional OSA in men - people with Upper Airway Resistance Syndrome(mostly identical mechanism as OSA, less oxygen desaturation, more arousals, slightly different symptoms) which is how SDB tends to manifest in women and younger people, the problem is way, way harder. In a community I used to hang out in, I'd say maybe 1 person in 10 actually benefitted from CPAP/BiPAP more than it hurt their sleep quality.
And this is for traditional OSA in men - people with Upper Airway Resistance Syndrome(mostly identical mechanism as OSA, less oxygen desaturation, more arousals, slightly different symptoms) which is how SDB tends to manifest in women and younger people, the problem is way, way harder. In a community I used to hang out in, I'd say maybe 1 person in 10 actually benefitted from CPAP/BiPAP more than it hurt their sleep quality.