Tuberculosis Research and Treatment / 2017 / Article / Tab 6

Research Article

Using Reduced Inoculum Densities of Mycobacterium tuberculosis in MGIT Pyrazinamide Susceptibility Testing to Prevent False-Resistant Results and Improve Accuracy: A Multicenter Evaluation

Table 6

Precision of MGIT PZA susceptibility test results stratified by inoculation method. Reproducibility of categorical results for each duplicate pair of isolates.

PrecisionPercentage (number) by inoculation method
BDAC

Precise  & accurate72.2 (109)87.6 (127)93.5 (131)
Precise & inaccurate15.2 (23)6.9 (10)2.9 (4)
Not precise12.6 (19)5.5 (8)3.6 (5)

Subtotal151145140
<2 results1.3 (2)5.2 (8)8.5 (13)

Total153153153

Each duplicate isolate had the same categorical susceptibility result. Each duplicate isolate had a different categorical susceptibility result. Denominators used to calculate precision percentages. Time-Out occurred in one or both of the duplicate pairs of isolates. Denominator used to calculate <2 results percentages.

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