Universität zu Köln

Spix, Claudia, Berthold, Frank, Hero, Barbara, Michaelis, Joerg and Schilling, Freimut H. (2016). Correction factors for self-selection when evaluating screening programmes. J. Med. Screen., 23 (1). S. 44 - 50. LONDON: SAGE PUBLICATIONS LTD. ISSN 1475-5793

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Abstract

Objective: In screening programmes there is recognized bias introduced through participant self-selection (the healthy screenee bias). Methods used to evaluate screening programmes include Intention-to-screen, per-protocol, and the post hoc approach in which, after introducing screening for everyone, the only evaluation option is participants versus non-participants. All methods are prone to bias through self-selection. We present an overview of approaches to correct for this bias. Methods: We considered four methods to quantify and correct for self-selection bias. Simple calculations revealed that these corrections are actually all identical, and can be converted into each other. Based on this, correction factors for further situations and measures were derived. The application of these correction factors requires a number of assumptions. Results: Using as an example the German Neuroblastoma Screening Study, no relevant reduction in mortality or stage 4 incidence due to screening was observed. The largest bias (in favour of screening) was observed when comparing participants with non-participants. Conclusions: Correcting for bias is particularly necessary when using the post hoc evaluation approach, however, in this situation not all required data are available. External data or further assumptions may be required for estimation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Spix, Claudia UNSPECIFIED UNSPECIFIED UNSPECIFIED Berthold, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED Hero, Barbara UNSPECIFIED UNSPECIFIED UNSPECIFIED Michaelis, Joerg UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilling, Freimut H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-283481
DOI:	10.1177/0969141315597959
Journal or Publication Title:	J. Med. Screen.
Volume:	23
Number:	1
Page Range:	S. 44 - 50
Date:	2016
Publisher:	SAGE PUBLICATIONS LTD
Place of Publication:	LONDON
ISSN:	1475-5793
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language CANCER; NEUROBLASTOMA; MORTALITY; TRIALS; MAMMOGRAPHY; BIAS; AGE; NONCOMPLIANCE; ATTENDANCE; ACCOUNT Multiple languages Public, Environmental & Occupational Health Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28348