Small RCT 79 PCR+ patients 55+ comparing pressure-based nasal irrigation with povidone-iodine and sodium bicarbonate, showing improved recovery with povidone-iodine, and 0/37 COVID-19 related hospitalizations for povidone-iodine compared to 1/42 for sodium bicarbonate. NCT04559035
Baxter et al., 8/17/2021, Randomized Controlled Trial, USA, North America, preprint, 9 authors, this trial compares with another treatment - results may be better when compared to placebo.
risk of hospitalization, 65.3% lower, RR 0.35, p = 1.00, treatment 0 of 37 (0.0%), control 1 of 42 (2.4%), continuity correction due to zero event (with reciprocal of the contrasting arm).
risk of hospitalization/ER, 79.0% lower, RR 0.21, p = 0.50, treatment 0 of 37 (0.0%), control 2 of 42 (4.8%), continuity correction due to zero event (with reciprocal of the contrasting arm).
risk of no recovery, 56.0% lower, RR 0.44, p = 0.03, treatment 6 of 25 (24.0%), control 18 of 33 (54.5%).
Effect extraction follows pre-specified rules
prioritizing more serious outcomes. For an individual study the most serious
outcome may have a smaller number of events and lower statistical signficance,
however this provides the strongest evidence for the most serious outcomes
when combining the results of many trials.