describe Fundamentals of biostatistics.
1. Name another common kind of bias that may occur in this type of study. Is it probable to have influenced the results here? describe your reasoning briefly.
2. What possible confounders have the authors recognised? How have they distributed with them at the design stage and during analysis? Is there probable to be residual confounding?
3. Do the authors deliberate the role of chance in this study? Deliberate this in relation to the results as well as what effect might it have on the internal validity.