Mahévas et al [53]. Comparative study HCQ group: n = 84; control group: n = 97 HCQ 600 mg/day for 7 days Compared with control group, a reduction of admissions to ICU or death 7 days after hospital admission was not observed in HCQ group. Relatively larger sample size in HCQ treatment and control groups. Nonrandomized design; In propensity score model, four possible important prognostic variables were unbalanced.