Retrospective 984 COVID-19 patients, 253 taking aspirin prior to admission, showing lower risk of respiratory support upgrade with treatment.
Sisinni et al., 10/4/2021, retrospective, Italy, Europe, peer-reviewed, 18 authors.
risk of death, 7.1% higher, RR 1.07, p = 0.65, treatment 93 of 253 (36.8%), control 251 of 731 (34.3%).
risk of death or respiratory support upgrade, 30.3% lower, RR 0.70, p = 0.01, treatment 253, control 731, multivariate.
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.