What epidemiological measures were used? Are they adequate? What levels of meas

What epidemiological measures were used? Are they adequate?
What levels of measurement were used? Give examples to support your answer. What tests of significance were used? What are the significant/non-significant findings? Specify what other tests of significance could have been used in this study?
Are there any biases or confounding variables in the study? How were they addressed?
What policy implications would you make based on this topic? Why or why not?