a) What do you mean by the study of hypothesis?
b) Illustrate the outcome variables and how were they measured?
c) Mention the study factors (or exposures) and how were they measured?
a) Illustrate the participation rate in this study? Describe its implications.
b) Illustrate the response rates in this study? Describe their implications.
c) Could information biases have influenced the results in any way? describe why or why not? Do the authors describe this possibility sufficiently?