Table 3.
The performance of various combinations of screening approaches to detect TB among hospital outpatients.
| Screening approach | Sensitivity (95%CI) | Specificity (95% CI) | ||
|---|---|---|---|---|
| Abnormal chest X-ray OR any symptom* | 100 | – | 39 | (37–42) |
| Abnormal chest X-ray OR cough >2 weeks | 81 | (67–95) | 71 | (69–73) |
| Abnormal chest X-ray | 55 | (37–72) | 82 | (80–83) |
| Current cough | 87 | (75–99) | 58 | (56–61) |
| Cough >2 weeks | 61 | (44–78) | 84 | (82–86) |
| Fever | 35 | (19–52) | 84 | (83–86) |
| Night sweats | 39 | (22–56) | 88 | (86–89) |
| Weight loss | 55 | (37–72) | 72 | (70–74) |
| At least 1 symptom(s) | 90 | (80–100) | 45 | (43–47) |
| At least 2 symptoms | 77 | (63–92) | 70 | (68–72) |
| At least 3 symptoms | 26 | (10–41) | 92 | (91–93) |
| All 4 symptoms | 13 | (1–25) | 98 | (97–98) |
| Cough > 2 weeks and/or at least 2 symptoms | 87 | (75–99) | 63 | (61–65) |
| Cough > 2 weeks and/or at least 3 symptoms | 68 | (51–84) | 80 | (78–81) |
⁎
Only those people who reported any of current cough, night sweats, weight loss or fever or who had an abnormal chest X-ray were referred for TB lab testing.