Starting time bias

Arises when there is a failure to identify a common starting time for an exposure or a disease.

Background

David Sackett in his 1979 list of biases described starting time bias as “Starting time bias. The failure to identify a common starting time for exposure or illness may lead to systematic misclassification.” Sackett, 1979. This relates to selection bias,  non-contemporaneous control bias and could be an example of [chronological bias].

Example

Please the catalogue entries on selection bias and chronological bias for examples.  

Impact

The impact of chronological bias and selection bias is described in the relevant catalogue entries.

Preventive steps

Preventive steps relevant for chronological bias and selection bias are given in the relevant catalogue entries.

Sources

Sackett DL. Bias in analytic research. J Chron Dis 1979; 32: 51-63.


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