Torah: nyu study that showed patients given the additional zinc had a 44% greater chance of survival
Jan 2021 article Andrew Ip, etc Hydroxychloroquine in the treatment of outpatients with mildly symptomatic COVID-19: a multi-center observational study – seems to be saying what you are saying: a retrospective study of 100 people with HCQ v. 1000 without, matching seems to be done pretty well. This and other similar study show benefit and only minor adverse reaction (2%).