The risk of infection after exposure to needlestick injury is 7.1 per 100,000. The risk of infection for those who were not exposed is 2.1 per 100,000. There were 50,000 people exposed in a population of 100,000 (that is, 50,000 people were exposed and 50,000 were not exposed). What is the population attributable risk, per 100,000 people? 2.5 7.1 20.2 40.8

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