You are a nurse in the Neonatal Intensive Care area who has noted that babies whose mothers lack prenatal care seem to end up with a low birth weight. You have decided to look at this phenomenon in your unit and found the following results:

Low Birth Weight Yes No Total

Lack Prenatal Care

Yes 75 175 250

No 20 180 200

Total 95 355 450

1. Calculate the probability of the babies with low birth weight having a mother who had prenatal care and the probability that the babies with low birth weight did not have prenatal care.
2. Calculate the odds of the babies with low birth weight having prenatal care and the odds for the babies not having prenatal care.
3. Calculate the odds ratio of no prenatal care as a risk factor. Include the confidence intervals.