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. 2022 Apr 5;17(4):e0266245. doi: 10.1371/journal.pone.0266245

Table 1. Study characteristics of included studies.

Author, year Study type Sample size, N Patient Population Average age, years Male Sex, n (%) Treatment duration, days Intervention and dosage
Treatment Control
Mareev et al, 2021 [23] RCT 43 COVID-19 61.9 (10.6) 59.9 (18.8) 30 (69.8) 13 (3.2) 1 mg during the first 1–3 days followed by 0.5 mg/day
Holby et al, 2021 [22] RCT 11340 COVID-19 within 24h 63.3 (13.8) 63.5 (13.7) 5609 (49.4) 28 N/A
Tardif et al, 2021 [20] RCT 4488 COVID-19 within 24 h of enrolment 53·7 (10.4) 54·0 (10.4) 2067 (46.1) 30 0·5 mg orally administered twice per day for the first 3 days and then once per day for 27 days
Deftereos et al, 2020 [21] RCT 105 Hospitalized with COVID-19 59.7 (4.6) 62.7 (11.4) 61 (58.1) 21 1.5-mg loading dose followed by 0.5 mg after 60 min and maintenance doses of 0.5 mg twice daily) with standard medical treatment for as long as 3 weeks
Lopes et al, 2021 [19] RCT 72 Moderate-severe COVID-19 53.8 (17.0) 54.7 (19.3) 35 (48.6) 7.0 (3.0) 0.5 mg thrice daily for 5 days, then 0.5 mg twice daily for 5 days; if bodyweight ≥80 kg, the first dose was 1.0 mg