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Exposure to medicine 'x' during pregnancy was investigated for 108 mothers of children with congenital defects and 108 mothers of normal controls

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Exposure to medicine 'x' during pregnancy was investigated for 108 mothers of children with congenital defects and 108 mothers of normal controls. The researchers examined exposure to medicine 'x' during the first trimester. Eighteen mothers of the affected children were found to have been exposed, whereas only six of the controls were exposed.

What is the correct test statistic that you calculated with the test above?