From post #1,686, we took the first author, Iacoviello, and tracked the study to this page, translated from the French:
'....There is a significant difference with the group treated with hydroxychloroquine....but it is necessary that by fall a serious meta-analysis on all published studies on hcq be carried out....30% reduction in mortality....Lisa Iacoviello, Director of the Center for Epidemiology and Preventive Medicine at the University of Insubrie, Varese, and Director of Epidemiology and Prevention at IRCCS Neuromed.
....
FS: "How many patients are affected by your study?"
LI: " Our study (COVID-19 Risk and CORIST Collaboration Treatments) was conducted on a cohort of 3,451 patients admitted to 33 clinical centers across Italy. This is a retrospective study." '