Question
number
Question definition
Q1 Were the criteria for inclusion in the sample clearly defined?
Q2 Were the study subjects and the setting described in detail?
Q3 Was the exposure measured validly and reliably?
Q4 Were objective, standard criteria used for measurement of the condition?
Q5 Were confounding factors identified?
Q6 Were strategies to deal with confounding factors stated?
Q7 Were the outcomes measured validly and reliably?
Q8 Was an appropriate statistical analysis used?