Evaluation of antimicrobial susceptibility testing of Nocardia spp. isolates by broth microdilution with resazurin and spectrophotometry

Table 2 Agreements (%) on comparisons within and between reading methods for BMD of Nocardia spp. isolates

Drugs	Agreement		Gold Standard	Resazurin	OD
AMK	Essential	Intra-reading	98.4	97.6	98.3
		^aInter-reading	―	90.8	99.2
		^a,bPearson’s r (95% CI)	―	0.50 (0.36–0.63)	0.92 (0.88–0.94)
	Categorical	Intra-reading	100.0	100.0	100.0
		^aInter-reading	―	100.0	100.0
		^aErrors: Very Major	―	0.0	0.0
		Major	―	0.0	0.0
		Minor	―	^cn.a.	^cn.a.
CIP	Essential	Intra-reading	91.7	94.4	93.4
		^aInter-reading	―	90.7	89.4
		^a,bPearson’s r (95% CI)	―	0.69 (0.58–0.77)	0.82 (0.76–0.87)
	Categorical	Intra-reading	82.7	88.1	77.9
		^aInter-reading	―	73.7	75.0
		^aErrors: Very Major	―	0.85	3.79
		Major	―	4.24	1.52
		Minor	―	21.2	19.7
MIN	Essential	Intra-reading	87.2	78.8	91.5
		^aInter-reading	―	80.0	93.8
		^a,bPearson’s r (95% CI)	―	0.90 (0.86–0.92)	0.90 (0.87–0.93)
	Categorical	Intra	88.0	89.8	91.5
		^aInter	―	85.6	87.7
		^aErrors: Very Major	―	0.0	0.0
		Major	―	0.0	0.0
		Minor	―	14.4	12.3

ISSN: 1471-2180