In a particular year in your health jurisdiction, there were 1000 births. In reviewing their birth certificates, you found that 72 had low birthweights (<2500 gms), and 158 had mothers who smoked during pregnancy. Of the mothers who smoked during pregnancy, you found that 19 had low birth weight babies .Show calculations   To explore the relationship between maternal smoking and the occurrence of low birth weight, construct the following a 2 x 2 contingency table.   What are the relative risks for each of the two sets of mothers?  What is the relative risk ratio?

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