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Table 1 Types of errors produced when testing imipenem susceptibilities of A. baummanii isolates by three commercial automated systems and two validated methods.

From: Detecting imipenem resistance in Acinetobacter baumannii by automated systems (BD Phoenix, Microscan WalkAway, Vitek 2); high error rates with Microscan WalkAway

  No (%) of indicated type of error compared to BMD result  
System/method (no. of strains tested) Very major Major Minor Kappa and P values
BD Phoenix (108) 0 3 (2,8) 0 κ = 0.919 P < 0.0001
MicroScan WalkAway (112) 28 (25)a 0 50 (44,6)a κ = 0.158 P < 0.0001
Vitek 2 (111) 0 0 8 (7,2) κ = 0.822 P < 0.0001
Etest (112) 0 0 2 (1,8) κ = 0.950 P < 0.0001
Disk diffusion (112) 2 (1,8)a 3 (2,7) 0 κ = 0.870 P < 0.0001
  1. aUnacceptable levels of error