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= 342,183 adults). We cross-randomized mask type (cloth versus surgical) and promotion strategies at the village and household level. Proper mask-wearing increased from 13.3% in the control group to 42.3% in the intervention arm (adjusted percentage point difference = 0.29; 95% confidence interval = 0.26, 0.31). The intervention reduced symptomatic seroprevalence (adjusted prevalence ratio = 0.91 0.82, 1.00), especially among adults ≥60 years old in villages where surgical masks were distributed (adjusted prevalence ratio = 0.65 0.45, 0.85). Mask distribution with promotion was a scalable and effective method to reduce symptomatic SARS-CoV-2 infections.
Jason Abaluck (Fri,) studied this question.