REACH Dictionary
Performance bias occurs when the interventionists in a research study do not all perform at the same level of quality, thus distorting the potential cause-effect relationship between the intervention and participant outcomes.
Pannucci, C. J., & Wilkins, E. G. (2010). Identifying and avoiding bias in research. Plastic and Reconstructive Surgery, 126(2), 619–625. https://doi.org/10.1097/PRS.0b013e3181de24bc
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Errors and biases