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Table 1 Comparison of microscopy, MGIT, and TK SLC-L for the detection of mycobacteria from clinical samples

From: Comparative evaluation of TK SLC-L, a rapid liquid mycobacterial culture medium, with the MGIT system

Variables Microscopy TK SLC-L MGIT
n % n % n %
Total positive results among the 146 samples 11 7.5 35 24.0 34 23.3
Among 46 culture-positive samples 11 23.9 35 76.1 34 73.9
Contamination NA NA 2 1.3 20 13.7
Min/max duration for growth detection (days) NA NA 5.2/34.8 2.0/34.1
Mean time to growth detection (days) NA NA 18.3 13.1
Median time to growth detection (days) NA NA 15.1 7.7
Sensitivity* (%) 23.9 76.1 73.9
Specificity* (%) 100 100 100
Positive predictive value* (%) 100 100 100
Negative predictive value* (%) 74.1 89.3 88.0
Accuracy* (%) 76.0 92.5 91.8
Correlation** (%) 42.1 80.6 53.0
  1. *Sensitivity, specificity, positive predictive, negative predictive, and accuracy values were calculated according to total mycobacterial isolation.
  2. **Pearson’s correlation.
  3. NA, Not applicable.