Read the following study, construct the appropriate 2x2 table, calculate the measure of association, state the study design, and state the interpretation of the results. A statewide outbreak of E. coli O:157 is being investigated. Confirmed cases of are being reported from several counties in Michigan. The suspected source of the E. coli O:157 is beef from a particular distributor. Investigators decided to investigate the association between E. coli O:157 and the beef by randomly select 50 households with a case living in the household and 50 control households from southeast Michigan. The households were asked whether they had purchased beef from this particular distributor. Among the households with a case of E. coli O:157 infection, 41 reported a history of buying beef from the distributor. Among the healthy control households, 16 gave a history of recently buying beef from this distributor. 2x2 table + -
Read the following study, construct the appropriate 2x2 table, calculate the measure of association, state the study design, and state the interpretation of the results.
A statewide outbreak of E. coli O:157 is being investigated. Confirmed cases of are being reported from several counties in Michigan. The suspected source of the E. coli O:157 is beef from a particular distributor. Investigators decided to investigate the association between E. coli O:157 and the beef by randomly select 50 households with a case living in the household and 50 control households from southeast Michigan. The households were asked whether they had purchased beef from this particular distributor. Among the households with a case of E. coli O:157 infection, 41 reported a history of buying beef from the distributor. Among the healthy control households, 16 gave a history of recently buying beef from this distributor.
- 2x2 table
|
|
+ |
- |
Total |
|
+ |
A |
B |
A+B |
|
- |
C |
D |
C+D |
|
Total |
A+C |
B+D |
A+B+C+D |
- List the values for each cell: A, B, C, D, A+B, C+D, A+C, B+D, A+B+C+D
- What type of study design is this?
- What measure of association should be used for this study?
- Calculate the measure of association (show your work)
- State your interpretation
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