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attributable risk=incidence rate of exposed-incidence rate of unexposed(kaplan)

attributable risk percent(ARP)=
incidence rate of exposed-incidence rate of unexposed/incidence rate of exposed or
RR-1/RR(uw)

my q is what is the diffrernece b/w AR and ARP and when to use them.
thanks

What is the difference between attributable risk(AR) and attributable risk percent(ARP)?

percent will be out of 100....


AR=incidence rate of exposed - incidence rate of unexposed

ARP=risk in exposed-risk in unexposed/risk in exposed