Monday, 28 November 2011

Incidence rate


It is the number of new cases of a specific disease reported during a given time interval divided by the estimated mid interval population at risk. It is given by the formula.
                        Number of new cases of specific diseases      during a given time period
            =                                                                             x1000
                                    Population of risk
Uses of incidence rate:
            (i) To control disease, and
            (ii) For research into aetiology and pathogenesis, distribution of diseases, and efficacy of preventive and therapeutic measures.


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