[Comparison of regression line analysis for several antibiotics on different media (author's transl)]

The method for performing regression analysis is described in detail. MIC values and zone sizes are determined on agar throughout. Applying these techniques, good correlation between MIC's and zone sizes (r = greater than -0.9) were found with 82% of 59 regressions (33 different antibiotics). Comparable results were found with DST- and Mueller-Hinton agar. In some cases a linear regression for MIC and zone size values could be demonstrated, independent from the correlation coefficient. Some theoretical aspects of regression analysis are discussed.