Table 1	Target Population (n=10,000)
Cases	Controls
Present	650	2250	2900
Absent	350	6750	7100
Total	1000	9000	10000
True Odds Ratio	5.57
True Prevalence Ratio	4.55
Taking a 50% unbiased sample overall
Assuming everyone is correctly classified, fill in the table below and calculate the measures of association
Table 2	Cases	Controls
Present
Absent
Total
Odds Ratio
Prevalence Ratio
Fill in the Table 3 below, where 20% of non-exposed cases in Table 2 is missclassified as exposed and 20% of non-exposed controls are misclassified as exposed
Calculate the measures of association
Table 3	Cases	Controls
Present
Absent
Total
Odds Ratio
Prevalence Ratio
Is this differential or non-differential bias?
Fill in the Table 4 below, where 40% of non-exposed cases in Table 2 is missclassified as exposed and 60% of non-exposed controls are misclassified as exposed
Calculate the measures of association
Table 4
Cases	Controls
Present
Absent
Total
Odds Ratio
Prevalence Ratio
Is this differential or non-differential bias?