2,541 patients in study. (p < 0.001) —for the non-biotech folks, p<.05 is the threshold for FDA drug approval. This result is far better. Mortality rate is cut in HALF by hydroxychloroquine. hydroxychloroquine mortality rate: 13.5% [95% CI: 11.6%-15.5%] Without hydroxychloroquine mortality rate: 26.4% [95% CI: 22.2%-31.0%]