Ratio in epidemiology

Ratio in epidemiology.I need example of how it is used in epidemiology and what type of data can be expressed like that.

Ratio in epidemiology.I need example of how it is used in epidemiology and what type of data can be expressed like that.Furthermore i have been told that there was 4 big categories of classification for variable and one of them is Ratio.I just eed further explanation and examples.

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