TABLE 3.
Cross tabulation of Xpert M. tuberculosis individual and pooled test concentrationsa
| Xpert semiquantitative M. tuberculosis level in pooled test | No. (%) of participants with the following individual Xpert semiquantitative M. tuberculosis level: |
||||
|---|---|---|---|---|---|
| Very low | Low | Medium | High | Total | |
| Negative | 5 (50) | 0 (0) | 0 (0) | 0 (0) | 5 (8) |
| Very low | 4 (40) | 7 (70) | 2 (8) | 0 (0) | 13 (21) |
| Low | 0 (0) | 3 (30) | 9 (38) | 0 (0) | 12 (20) |
| Medium | 1 (10) | 0 (0) | 9 (38) | 8 (47) | 18 (30) |
| High | 0 (0) | 0 (0) | 4 (17) | 9 (53) | 13 (21) |
| Total | 10 (100) | 10 (100) | 24 (100) | 17 (100) | 61 (100) |
a
Only results for pools containing one GeneXpert-positive sample are included. Xpert semiquantitative M. tuberculosis levels were classified as follows: very low, CT value of >28; low, CT value of 22 to 28; medium, CT value of 16 to 22; high, CT value of <16.