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Baseline and posttreatment QTc interval in the monotherapy and combination therapy groups. Hydroxychloroquine alone group mean ± SD values: baseline QTc interval = 459.9 ± 38.3, posttreatment QTc interval = 462.5 ± 43.1, and ΔQTc = 2.6 ± 29.1. Hydroxychloroquine and azithromycin group mean ± SD values: baseline QTc interval = 447.1 ± 44.1, posttreatment QTc interval = 464.3 ± 59.1, and ΔQTc = 17.2 ± 53.4.
