Membership bias

Membership in a specific group can be associated with a degree of health that differs significantly from the general population. Doing a study that focused specifically on joggers, or the employed, or physicians may suffer from membership bias.

Membership bias is a type of selection bias.

 

References

Sackett DL. Bias in analytic research. Journal of chronic diseases. 1979; 32(1-2):51-63. PMID: 447779