Table 2.
Mycobacterial yield from EM and spot sputum samples by different culture methods (n = 1862).
| Culture method | Results | Spot samples n (%) |
EM samples n (%) |
EM and spot samples n (%) |
Total n (%) |
|---|---|---|---|---|---|
| LJ (P < 0.001) | MTBC positive | 1 (0.1) | 2 (0.1) | 3 (0.2) | 6 (0.3) |
| MOTT | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | |
| Culture negative | 1831 (98.3) | 1806 (97.0) | 1859 (99.8) | 1772 (95.2) | |
| Contaminated | 30 (1.61) | 54 (2.9) | 0 (0.0) | 84 (4.5) | |
|
| |||||
| MGIT (P < 0.001) | MTBC positive | 6 (0.3) | 12 (0.6) | 3 (0.2) | 21 (1.1) |
| MOTT | 106 (5.7) | 119 (6.4) | 0 (0.0) | 225 (12.1) | |
| Culture negative | 380 (20.4) | 301 (16.2) | 1859 (99.8) | 681 (36.6) | |
| Contaminated | 436 (23.4) | 499 (26.8) | 0 (0.0) | 935 (50.2) | |
EM: early morning; MTBC: mycobacterium tuberculosis complex, MOTT: mycobacterium other than tuberculosis, LJ: Lowenstein Jensen, MGIT: mycobacterium growth indicator tube. IY: incremental yield, LJ: Lowenstein Jensen, MGIT: mycobacterium growth indicator tube.