Bias in Clinical Trials


1. Where Bias Can Be Introduced

(This section is organised in the form of a book, please follow the blue arrows to navigate through the book or by following the navigation panel on the right side of the page.)

Bias can occur at any phase of research, including trial design, data collection, as well as in the process of data analysis and publication. The bias that can occur at different stages during a clinical trial are described in the sections that follow.