Table 4.
Comparison of results of determinations of time to detection in days (all, MTBC, late-growing MTBC, and MTBC recovered on solid media only by laboratory site)
| System and site code | Median TTD (IQR)a |
No. MTBC recovered in: |
||||
|---|---|---|---|---|---|---|
| All mycobacteria | MTBC |
|||||
| Smear positive | Smear negative | All | Solid media onlyc | Broth (>5 wk) | ||
| MGIT | ||||||
| B | 13 (7.5–20.5) | 15 (11–19) | 21 (15–28) | 16 (12–20) | 3 | 4 |
| D | 9 (4–15) | 6 (4–9) | 13.5 (10.25–18) | 11 (5–15) | 0 | 0 |
| F | 14 (7.5–20) | 13 (9–15.5) | 15 (12.5–21.5) | 14 (10.75–16.5) | 1 | 0 |
| H | 11 (7–16.5) | 8 (7.75–9.25) | 15 (11.5–20.5) | 13 (9–17) | 0 | 0 |
| K | 14 (9–20) | 11 (9–14) | 16 (14–21) | 14 (11–18) | 0 | 0 |
| L | 12 (6–16) | 12 (7–15) | 16 (13–21) | 12.5 (7.75–16) | 0 | 0 |
| Total MGIT | 13 (7–19) | 12 (8–16) | 16 (13–21) | 14 (10–18) | 4 | 4 |
| BacT/Alert | ||||||
| C | 21.5 (6–35) | 30 (20.5–32) | 28 (25–31) | 28 (23.5–31.5) | 1 | 0 |
| G | 17.5 (4–47) | 14 (8.75–18.25) | 25 (14–34.5) | 16 (10–25.75) | 2 | 8 |
| M | 19.5 (2–62) | n/ab | 23 (16.5–30.5) | 23 (16.25–30.5) | 0 | 0 |
| Total BacT/Alert | 16 (13–22.75) | 14 (9–19) | 26 (15.75–32) | 18 (11–27.5) | 3 | 8 |
a
TDD, time to detection in days; IQR, interquartile range.
b
n/a, site had no smear-positive MTBC.
c
Broth did not signal by end of incubation period.