Biostatistics Quiz
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A cohort study followed 2,000 healthcare workers during a pandemic. Among the 800 workers who consistently wore N95 masks, 20 developed infection. Among the 1,200 workers who wore surgical masks, 60 developed infection. If mask-wearing behavior was associated with other protective behaviors, and this resulted in a 40% overestimate of the protective effect of N95 masks, what is the bias-adjusted relative risk?
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