QuestionSBA
QuestionChoice
This is the definition of the statistical concept ‘number needed to treat’ (NNT). For example, if a drug has an NNT of 6, it means that 6 patients would have to be treated with the drug to prevent one additional detrimental outcome.
10004729
d
The number of patients over a given period that would need treatment to prevent a particular detrimental outcome
QuestionChoice
This is the definition of positive predictive value, which is used in the evaluation of diagnostic tests. This can also be calculated from the sensitivity, specificity and prevalence of the condition.
10004728
c
The proportion of those who test positive for a disease that actually have the disease
QuestionChoice
This is the definition of sensitivity, another measure used in the evaluation of diagnostic tests.
10004727
b
The probability that an individual with a disease will test positive for the disease
QuestionChoice
This is the definition of the 95% confidence interval. For example, if the prevalence of a disease is measured as 0.9% (CI 0.73-1.08%), we can be 95% sure that the true value of the prevalence is between 0.73% and 1.08%.
10004730
e
The interval around an estimate in which there is 95% confidence that the true value lies
QuestionChoice
This is the definition of specificity, which is a measure used to evaluate the suitability of diagnostic tests. Ideally, diagnostic tests should be highly sensitive and highly specific.
10004726
a
The probability that an individual without a disease will test negative for the disease
Concept
Chapter
2693
4325
Evaluation of a diagnostic test
Topic
178
Medical Statistics
13492
Which statement best describes the definition of the term ‘specificity’?
a