Figure 2

Multiple linear regression for all generics and their respective innovators. Except for VAN-Abbott (black circles on panel C), data of concentration-effect relationship of all generic products are overlaid and can be described by the simple regression (black line) of the innovator product of amikacin (A), gentamicin (B) and vancomycin (C). Significant difference in the intercept of VAN-Abbott is evident by its linear regression behavior (black short dash line on panel C) compared with the regression of the innovator.