"Baseline levels" refer to the normal or usual levels of something, usually used in scientific or medical contexts. It represents a standard measure against which changes or variations can be compared. Full definition
The authors suggest that collecting saliva samples prior to arrival at the laboratory might have produced a more accurate assessment of baseline levels of cortisol. (cebc4cw.org)
The reduced inflammation ramps up your metabolism and keeps blood sugar at baseline levels. (detoxdiy.com)
Most intervention effects were moderated by school environment, with effects stronger in less disadvantaged schools, and effects on aggression were larger in students who showed higher baseline levels of aggression. (cebc4cw.org)