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Table 9: 
Test item bank security measures.
Security MeasureMeanMedian
Item exposure rate .10% .08% 
Test overlap rate .43% <.01% 
Examinee overlap rate .58% <.01% 
Security MeasureMeanMedian
Item exposure rate .10% .08% 
Test overlap rate .43% <.01% 
Examinee overlap rate .58% <.01% 
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