Baseline factors usually refer to factors or variables used as comparison or reference points in research or analysis. It can be a point in time, a specific condition or state, or a specific group or individual.
In many studies, baseline factors are used to determine the state or characteristics of subjects before the start of the study, so as to compare with the changes during the study or after the intervention. In medical research, baseline factors may include the patient's age, gender, weight, health status and so on.