Question: In a cohort study the risk ratio for COPD for moderate smokers versus non-smokers was 3.0. For heavy smokers compared to non-smokers, the risk ratio

In a cohort study the risk ratio for COPD for moderate smokers versus non-smokers was 3.0. For heavy smokers compared to non-smokers, the risk ratio was 9.0.

What would the risk ratio be for non-smokers, if heavy smokers were the reference category (2 decimal places)?

What would the risk ratio be for moderate smokers, if heavy smokers were the reference category (2 decimal places)?

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