Table 2.
The characteristics of 2051 people screened for TB according to whether TB was confirmed, and the number needed to screen (NNS) to identify one person with TB.
| Characteristic | All (n) | TB confirmed (n) | TB confirmed (%, 95% CI) | p-value | Number needed to screen, NNS | ||
|---|---|---|---|---|---|---|---|
| Total | 2051 | 31 | 1.5% | (1.1–2.1) | 66 | ||
| Age (years) | 15–34 | 820 | 13 | 1.6% | (0.9–2.7) | 0.32 | 63 |
| 35–54 | 670 | 13 | 1.9% | (1.1–3.3) | 52 | ||
| 55+ | 561 | 5 | 0.9% | (0.4–2.1) | 112 | ||
| Sex | Male | 772 | 15 | 1.9% | (1.2–0.3.2) | 0.26 | 51 |
| Female | 1279 | 16 | 1.3% | (0.8–2.0) | 80 | ||
| Prior TB treatment (n = 2037) | No | 1982 | 30 | 1.5% | (1.1–2.2) | 0.57 | 66 |
| Yes | 55 | 1 | 1.8% | (0.3–9.6) | 55 | ||
| Number of symptoms (CFSW) | 0 | 914 | 3 | 0.3% | (0.1–1.0) | <0.001 | 305 |
| 1 | 500 | 4 | 0.8% | (0.3–2.0) | 125 | ||
| 2 | 473 | 16 | 3.4% | (2.1–5.4) | 30 | ||
| 3 | 116 | 4 | 3.4% | (1.3–8.5) | 29 | ||
| 4 | 48 | 4 | 8.3% | (3.3–19.6) | 12 | ||
| Current cough* | No | 1184 | 4 | 0.3% | (0.1–0.9) | <0.001 | 296 |
| Yes | 867 | 27 | 3.1% | (2.1–4.5) | 32 | ||
| Cough >2 weeks | No | 1710 | 12 | 0.7% | (0.4–1.2) | <0.001 | 143 |
| Yes | 341 | 19 | 5.6% | (3.6–8.5) | 18 | ||
| Fever | No | 1724 | 20 | 1.2% | (0.8–1.8) | 0.006 | 86 |
| Yes | 327 | 11 | 3.4% | (1.9–5.9) | 30 | ||
| Night sweats | No | 1791 | 19 | 1.1% | (0.7–1.7) | <0.001 | 94 |
| Yes | 260 | 12 | 4.6% | (2.7–7.9) | 22 | ||
| Weight loss | No | 1472 | 14 | 1.0% | (0.6–1.6) | 0.002 | 105 |
| Yes | 579 | 17 | 2.9% | (1.8–4.7) | 34 | ||
| Chest x-ray abnormal by radiologist | No | 1662 | 14 | 0.8% | (0.5–1.4) | <0.001 | 119 |
| Yes | 389 | 17 | 4.4% | (2.7–6.9) | 23 | ||
| HIV-positive (30 TB cases) | No | 20 | |||||
| Yes | 10 | ||||||
CFSW: C, current cough, F, fever, S, night sweats, W, weight loss.