the slope of each test group against the slope of the control group.
According to Wagner’s criteria (1991), a substance is considered to have no immunostimulation effect or possess
an immunosuppressive effect if the ratio of the mean regression of the substance to the regression coefficient (kr) of
the control (phagocytic or clearance index: k) is less than 1, possess a medium immunostimulation effect if the k
value is in between 1.0-1.5 and a strong immunostimulation effect if the k value is more than 1.5.