1) a) Explain the study of the hypothesis?
b) State the outcome variables and how were they determined?
c) Explain the study factors (exposures) and how were they determined?
2) a) Specify the participation rate in this study? Discuss its implications.
b) State the response rates in this study? Discuss their implications
3) Could information biases have affected the results in any way? Why or why not? Whether the authors discuss this possibility adequately?