Variation of a test's sensitivity and specificity with disease prevalence

Leeflang, Mariska M. G.; Rutjes, Anne W. S.; Reitsma, Johannes B.; Hooft, Lotty; Bossuyt, Patrick M. M. (2013). Variation of a test's sensitivity and specificity with disease prevalence. CMAJ, 185(11), E537-E544. Canadian Medical Association 10.1503/cmaj.121286

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BACKGROUND Anecdotal evidence suggests that the sensitivity and specificity of a diagnostic test may vary with disease prevalence. Our objective was to investigate the associations between disease prevalence and test sensitivity and specificity using studies of diagnostic accuracy. METHODS We used data from 23 meta-analyses, each of which included 10-39 studies (416 total). The median prevalence per review ranged from 1% to 77%. We evaluated the effects of prevalence on sensitivity and specificity using a bivariate random-effects model for each meta-analysis, with prevalence as a covariate. We estimated the overall effect of prevalence by pooling the effects using the inverse variance method. RESULTS Within a given review, a change in prevalence from the lowest to highest value resulted in a corresponding change in sensitivity or specificity from 0 to 40 percentage points. This effect was statistically significant (p < 0.05) for either sensitivity or specificity in 8 meta-analyses (35%). Overall, specificity tended to be lower with higher disease prevalence; there was no such systematic effect for sensitivity. INTERPRETATION The sensitivity and specificity of a test often vary with disease prevalence; this effect is likely to be the result of mechanisms, such as patient spectrum, that affect prevalence, sensitivity and specificity. Because it may be difficult to identify such mechanisms, clinicians should use prevalence as a guide when selecting studies that most closely match their situation.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Social and Preventive Medicine (ISPM)

UniBE Contributor:

Rutjes, Anne

Subjects:

600 Technology > 610 Medicine & health
300 Social sciences, sociology & anthropology > 360 Social problems & social services

ISSN:

0820-3946

Publisher:

Canadian Medical Association

Language:

English

Submitter:

Doris Kopp Heim

Date Deposited:

08 Feb 2014 09:31

Last Modified:

06 Jul 2017 14:05

Publisher DOI:

10.1503/cmaj.121286

PubMed ID:

23798453

BORIS DOI:

10.7892/boris.41072

URI:

https://boris.unibe.ch/id/eprint/41072

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