Given that it’s hard to know if selection bias slipped in anywhere, for example during recruiting:
> During the study period, 826 unique patients aged 55 and older were eligible to be contacted within 24 hours of a positive PCR; 79 were able to be enrolled and receive irrigation materials on the day of contact.
Patients who initiated isotonic saline nasal irrigation after a positive COVID-19 PCR test were 19 times less likely to be hospitalized than the national rate.
One day soon I will go to Lidl and buy Covid testing kit...
What have the authors been doing since?
Sinus flush can fuck up the balance in your nostrils, possibly increase the mucus production of the membranes. Which will encourage you to flush more "since you're washing out a lot of mucus, so the whole process working". It's a vicious cycle. Source: me. I have a stuffy nose issue for years now, even after surgery. In general it's only annoying during the morning and while I sleep.