Table 4.
Classification of TB patients according to WHO case definitions, anatomical site, and previous TB treatment (n [%])9,10
| Total | Adults | Children | Summary of definition9,10 | |
|---|---|---|---|---|
| N = 201 | N = 170 | N = 31 | ||
| Adults (WHO9) | ||||
| Bacteriologically confirmed | NA | 126 (74.1) | NA | Positive microscopy or culture |
| Clinically diagnosed | NA | 44 (25.9) | NA | Diagnosis by clinician or other medical practitioner |
| Children (Graham and others10) | ||||
| Confirmed TB | NA | NA | 7 (22.6) | Microbiological confirmation |
| Probable TB | NA | NA | 17 (54.8) | Chest X-ray consistent with TB and one of the following: exposure to TB or positive TB treatment response or immunological evidence of TB |
| Possible TB | NA | NA | 5 (16.1) | Chest X-ray consistent with TB or exposure to TB or positive TB treatment response or immunological evidence of TB |
| TB unlikely | NA | NA | 2 (6.5) | Not fitting the above definitions |
| Anatomical site (WHO9) | ||||
| Pulmonary | 190 (94.5) | 161 (94.7) | 29 (93.5) | Involving lung parenchyma or tracheobronchial tree |
| Extrapulmonary* | 9 (4.5) | 9 (5.3) | 0 | Exclusively involving organs other than the lungs |
| Classification based on history of previous TB treatment (WHO9) | ||||
| New TB | 165 (82.1) | 140 (82.4) | 25 (80.6) | No previous TB treatment |
| Previous TB treatment | 30 (14.9) | 24 (14.1) | 6 (19.4) | Previous TB treatment of 1 month or more |
| Relapse | 13 (6.5) | 11 (6.5) | 2 (6.5) | Previously declared cured or TB treatment completed |
| Treatment after failure | 3 (1.5) | 3 (1.8) | 0 | Most recent TB treatment failed |
| Treatment after LTFU | 11 (5.5) | 8 (4.7) | 3 (9.7) | LTFU at the end of most recent TB treatment |
| Other previously treated patients | 3 (1.5) | 2 (1.2) | 1 (3.2) | Most recent TB treatment outcome unknown |
| Patients with unknown previous TB history | 6 (3.0) | 6 (3.5) | 0 | Do not fit into any of the categories listed above |
LTFU = lost to follow-up; NA = not available; TB = tuberculosis; WHO = World Health Organization.
*
For two children data for classification based on anatomical site were not available.