Use the results from Exercise 13.7 to calculate: (a) the odds ratio that a Down syndrome baby had a mother who smoked while pregnant, compared to a Down syndrome baby who had a mother who didn’t...

Use the results from Exercise 13.7 to calculate: (a) the odds ratio that a Down syndrome baby had a mother who smoked while pregnant, compared to a Down syndrome baby who had a mother who didn’t smoke, for (i) mothers aged under 35, (ii) mothers aged 35 and over. (b) Now, do it the other way round, that is, calculate the odds ratio that a mother having a Down syndrome baby smoked while pregnant, compared to a mother who didn’t smoke having a Down syndrome baby. (c) Interpret your results in both cases.