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Flashcards in Screening Deck (13):
1

reliability of a screeening test depends on __+__

repeatability of test (method variation)
repeatability of interpretation (observer variation)

2

validity of a test depends on (4)

sensitivity
specificity
PPV
NPV

3

proportion of people who don't have the disease who tested negative =

specificity

4

(-ve test given don't have disease / total who dont have it ) x 100 =

specificity

5

proportion of people who have disease and tested +ve =

sensitivity

6

(+ve test given have disease / total who have disease)x100 =

sensitivity

7

proportion who test +ve and have disease

PPV

8

(have disease given tested +ve / total who tested +ve)x100 =

PPV

9

proportion who test -ve and don't have disease

NPV

10

(don't have disease given tested -ve / total who tested -ve)x100 =

NPV

11

Must test screening test in __ as in ___ there is a higher prevalence of the disease because if is low prevalence really then most +ves won't have disease even if sens and spec is high

community
not in outpatients

12

Yield of screening test =

number of undiagnosed cases picked up by screening

13

Wilson and Jungner's criteria for screening = (7)

common+/serious condition
well defined latent period
suitable test with high spec+sens
effective treatment option
early detection = better prognosis
harm of test is low
cost effective