ABSITE Test Questions and Answers-
Statistics
Proportion of truly diseased persons in a screened population who are identified as being diseased by
the test. It is a measure of the probability of correctly diagnosing a condition. - Answer-Sensitivity
True positive/(true positive + false negative) - Answer-Sensitivity
The proportion of truly nondiseased persons who are so identified by the screening test - Answer-
Specificity
True negative/(false positive + true negative) - Answer-Specificity
1 - [True negative/(false positive + true negative)] - Answer-False-positive rate
1 - [True positive/(true positive + false negative)] - Answer-False-negative rate
The probability that a person with a positive test result has the disease - Answer-Positive predictive
value
True positive/(true positive + false positive) - Answer-Positive predictive value
, The probability that a patient with a negative test result really is free of the disease - Answer-Negative
predicted value
True negative/(false negative + true negative) - Answer-Negative predicted value
The total number of cases of a given disease in a specified population at a designated time - Answer-
Prevalence
The number of new cases of a given disease during a given period in a specified population - Answer-
Incidence
The absolute arithmetic difference in outcome rates between control and experimental patients in a
trial - Answer-Absolute risk reduction
The proportional reduction in outcome rates between control and experimental patients in a trial -
Answer-Relative risk reduction
A range of values that has a specified probability of containing the rate or trend: - Answer-Confidence
intervals
A method of studying a drug or procedure in which both the subjects and investigators are kept
unaware of who is actually getting which specific treatment: - Answer-Double-blind method
The number of patients who need to be treated to prevent one adverse outcome - Answer-Number
Needed To Treat
The probability that an event will occur - Answer-Risk
The number of units in a population to be studied: - Answer-Sample size
Statistics
Proportion of truly diseased persons in a screened population who are identified as being diseased by
the test. It is a measure of the probability of correctly diagnosing a condition. - Answer-Sensitivity
True positive/(true positive + false negative) - Answer-Sensitivity
The proportion of truly nondiseased persons who are so identified by the screening test - Answer-
Specificity
True negative/(false positive + true negative) - Answer-Specificity
1 - [True negative/(false positive + true negative)] - Answer-False-positive rate
1 - [True positive/(true positive + false negative)] - Answer-False-negative rate
The probability that a person with a positive test result has the disease - Answer-Positive predictive
value
True positive/(true positive + false positive) - Answer-Positive predictive value
, The probability that a patient with a negative test result really is free of the disease - Answer-Negative
predicted value
True negative/(false negative + true negative) - Answer-Negative predicted value
The total number of cases of a given disease in a specified population at a designated time - Answer-
Prevalence
The number of new cases of a given disease during a given period in a specified population - Answer-
Incidence
The absolute arithmetic difference in outcome rates between control and experimental patients in a
trial - Answer-Absolute risk reduction
The proportional reduction in outcome rates between control and experimental patients in a trial -
Answer-Relative risk reduction
A range of values that has a specified probability of containing the rate or trend: - Answer-Confidence
intervals
A method of studying a drug or procedure in which both the subjects and investigators are kept
unaware of who is actually getting which specific treatment: - Answer-Double-blind method
The number of patients who need to be treated to prevent one adverse outcome - Answer-Number
Needed To Treat
The probability that an event will occur - Answer-Risk
The number of units in a population to be studied: - Answer-Sample size
