Relative risk

Relative risk

Relative risk: This risk of a disease symbolized by relative risk is the ration of incidence in exposed persons to incidence in non exposed person.

Incidence of disease among exposed (Ic)

RR:

Incidence of disease among non exposed (Io)

RR<1: Exposure is associated with reduced risk of disease.

RR=1: No associated between exposure and disease.

RR>1: Exposure associated with increased risk of disease.

Probability: ƩN (Ʃ=Event that occur, N=Number of event)

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