Q1: Were the two groups similar and recruited from the same population?
Q2: Were the exposures measured similarly to assign people to both
exposed and unexposed group?
Q3: Was the exposure measured in a valid and reliable way?
Q4: Were confounding factors identified?
Q5: Were strategies to deal with confounding factors stated?
Q6: Were the groups/participants free of the outcome at the start of the
study (or at the moment of exposure)?
Q7: Were the outcomes measured in a valid and reliable way?
Q8: Was the follow up time reported and sufficient to be long enough for
outcomes to occur?
Q9: Was follow up complete, and if not, were the reasons to loss to
follow up described and explored?
Q10: Were strategies to address incomplete follow up utilized?
Q11: Was appropriate statistical analysis used?