Table 3.

Absolute risk reduction and relative risk in incident SARS-CoV-2 infection between the different interventions and comparator (vitamin C). Confidence intervals are bootstrap intervals using each cluster (residential level) as the sampling unit. The Bonferroni corrected alpha is 0.0125; Confidence intervals are calculated at 98.75% to match the Bonferroni corrected alpha.

Arm	Infected (N)	Total (N)	SARS-CoV-2 positivity (%, 98.75%CI)	Absolute risk reduction (%, 98.75%CI)	Relative risk (ratio, 98.75%CI)
Vitamin C	433	619	70 (57, 81)	Reference	Reference
Hydroxychloroquine	212	432	49 (31, 62)	21 (2, 42)	0.70 (0.44, 0.97)
Ivermectin	398	617	65 (51, 73)	5 (–10, 22)	0.93 (0.71, 1.18)
Povidone-iodine	338	735	46 (35, 56)	24 (7, 39)	0.66 (0.48, 0.88)
Zinc and Vitamin C	300	634	47 (27, 72)	23 (–5, 46)	0.67 (0.38, 1.08)