Question: 1) When a coordinator probes (questions) cases slightly differently than he/she does controls, there is a probability of A) Selection Bias B) Recall Bias C)

1) When a coordinator probes (questions) cases slightly differently than he/she does controls, there is a probability of

A) Selection Bias

B) Recall Bias

C) Interviewer Bias

D) Misclassification Bias

1) When a coordinator probes (questions) cases

Odd ratio is a measure of association between exposure and disease in case-control studies. This measure compares the odds of disease among exposed individuals divided by the odds of disease among unexposed individuals. Based on the 2x 2 table, what is the correct formula for Odds Ratio, OR? disease non-disease Total exposed a b (a + b) non-exposed C (c + d) Total (a + c) ( b + d) (a+b+ c+d) O OR = (a+b)/ (c+d) O OR=(a x d)/(b x c) O OR = (a + c) / (b+d) O none of the above O all of the above

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