Relative risk
RR is the most common measure for the association between esposure and outcome.The meaning is how many times the risk of exposed people is that of unexposed.
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If RR=1 it means the risk in exposed group and unexposed group are equal ,there is no association between the exposure and the outcome.
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If RR>1 it means the risk in exposed group is greater than the unexposed group,there is a positive association between the exposure and the outcome. 公卫论坛
If RR<1 it means the risk in exposed group is less than the unexposed group,there is a negative association between the exposure and the outcome.
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