Question:
When applying the principles of evidence-based practice the term specificity means the proportion of people who test:
Choice 1:
positive when a condition is really absent.
Choice 2:
who test negative when a condition is really absent.
Choice 3:
positive when a condition is really present.
Choice 4:
negative when a condition is really present.
Rationale for correct answer:
"The value for specificity is gvern by d/(b+d), which represents the proportino of individuals who test negative for the condition out of all those who are trly normal, or the probability of a negative test in those who do not have the target condition. A highly specific instrument will rarely test positive when a person does not have the disease." (Portney/Watkins)
