Epidemiology. The ratio of the incidence (new cases in a time interval) in the population examined to that in the whole population, after taking account (standardizing) of differences in sex and age.
SIR of 1 indicates that the number of observed cases corresponds to the number of expected cases. SIR greater than 1 indicates more observed cases (higher incidence), SIR below 1 less observed cases than expected.
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