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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