Module 18 2021

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2/9/2021

Data collection: comprehensive searches

• Search strategy can introduce bias through missed data if not sufficiently: • Systematic • Sensitive • Specific Common errors include: • Poorly defined research questions • Limited, narrow or missing search terms • Excessively specific search terms (eg too many “ands”) • Inappropriate exclusion criteria • Irrelevant devices / studies retrieved

Data collection: other sources of bias

Type of bias

Definition

Publication bias

The publication or non-publication of research findings depending on the nature and direction of results

Time lag bias

The rapid or delayed publication of research findings depending on the nature and direction of the results

Multiple publication bias

The multiple or singular publication of research findings, depending on the nature and direction of the results

Location bias

The publication of research findings in journals with different ease of access or levels of indexing

Citation bias

The citation or non-citation of research findings depending on direction of results

Language bias

The publication of research findings in a particular language

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