Table 1. Proportion of IGRA and TST positivity, stratified by age.
| Non-TB hospital | TB hospital | p value | ||||
| No. positive/No. tested | (%) | No. positive/No. tested | (%) | |||
| IGRA | ||||||
| 20–29* | 6/26 | (23.1) | 21/55 | (38.2) | ||
| 30–39 | 4/13 | (30.8) | 23/48 | (47.9) | ||
| 40–49 | 43/87 | (49.4) | 20/39 | (51.3) | ||
| ≥50 | 18/24 | (75.0) | 7/8 | (87.5) | ||
| Combined** | 0.13 | |||||
| One-step TST, ≥10 mm | ||||||
| 20–29* | 7/26 | (26.9) | 28/51 | (54.9) | ||
| 30–39 | 5/13 | (38.5) | 32/44 | (72.7) | ||
| 40–49 | 47/86 | (54.7) | 32/37 | (86.5) | ||
| ≥50 | 19/24 | (79.2) | 6/7 | (85.7) | ||
| Combined** | <0.0001 | |||||
| One-step TST, ≥15 mm | ||||||
| 20–29* | 2/26 | (7.7) | 5/51 | (9.8) | ||
| 30–39 | 5/13 | (38.5) | 15/44 | (34.1) | ||
| 40–49 | 27/86 | (31.4) | 17/37 | (45.9) | ||
| ≥50 | 12/24 | (50.0) | 2/7 | (28.6) | ||
| Combined** | 0.45 | |||||
| Two-step TST, ≥10 mm | ||||||
| 20–29* | 8/26 | (30.8) | 28/51 | (54.9) | ||
| 30–39 | 5/13 | (38.5) | 33/44 | (75.0) | ||
| 40–49 | 60/86 | (69.8) | 32/37 | (86.5) | ||
| ≥50 | 19/24 | (79.2) | 6/7 | (85.7) | ||
| Combined** | 0.0004 |
TB: Tuberculosis; IGRA: Interferon-gamma release assay; TST: Tuberculin skin test.
*
Years old.
**
Mantel-Haenszel test for stratified data.