Question: The table below shows the odds ratios for the outcome of cleft lip and palette in newborns among pregnant women with particular genotypes of a

The table below shows the odds ratios for the outcome of cleft lip and palette in newborns among pregnant women with particular genotypes of a SNP from the TGFa gene (Any A2 genotype compared to only A1 genotypes), additionally stratified by maternal smoking status during pregnancy. The odds ratios displayed below are an example of which of the following? (Choose the one best answer)

Smoking during pregnancy

Genotype

Odds ratio

Heavy smoker

Any A2

5.10

Heavy smoker

Only A1

1.79

Non or light smoker

Any A2

0.68

Non or light smoker

Only A1

1.00 (Reference)

Confounding

Environment-environment interaction

Gene-environment interaction

Gene-gene interaction

None of the above

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