I'm not sure why this study from 7 years ago is being dug up because it's not a particularly good, interesting, or definitive study. Some problems with it:
1. Small sample sizes.
2. Significance was only found in one subset of the population. Given enough ways to divide up groups of people, you will almost always get false positives.
3. Not an experimental design.
4. The study did not control for simple factors like income or the health of the parent.
1. Small sample sizes.
2. Significance was only found in one subset of the population. Given enough ways to divide up groups of people, you will almost always get false positives.
3. Not an experimental design.
4. The study did not control for simple factors like income or the health of the parent.