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Effects on disease risk Genotype In the absence of envlronmentf No effect, Khoury et al. (24). t R, = disease risk among persons with exposure without genotype, divided by disease risk among persons with no exposure and no susceptible genotype; and R g = disease risk among persons with genotype without exposure, divided by disease risk among persons with no exposure and no susceptible genotype.
Yang et al. (Wed,) studied this question.