Figure 4

Scattergram results comparing polymyxin B MICs determined by Etest with those by the broth microdilution reference method (n = 78). The diagonal black line represents complete agreement, and the numbers represent the occurrences observed at each point. The broken lines represent ± 1-log₂ MIC agreement limits between test results. Horizontal and vertical broken lines indicate the resistant MIC breakpoint ≥8 mg/L) [10].