Table 7 Sensitivity, specificity, and positive likelihood ration to predict TB by different cutoff points of propensity score in various TB screening models
Cutoff points of propensity score (< vs ≥) | Total (N) | Bacteriologically confirmed TB | Positive likelihood ratio | |||||
|---|---|---|---|---|---|---|---|---|
Positive (N = 311) | Negative (N = 51,056) | Â | ||||||
n | Sensitivity (%) | 95% CI | n | Specificity (%) | 95% CI | Â | ||
Combined model A | ||||||||
 0.001 | 39,230 | 299 | 97.0 | 94.0–98.0 | 38,931 | 23.0 | 23.0–24.0 | 1.3 |
 0.005 | 16,314 | 239 | 77.0 | 72.0–82.0 | 16,075 | 68.0 | 68.0–69.0 | 2.4 |
 0.0053 | 15,567 | 235 | 76.0 | 71.0–81.0 | 15,332 | 70.0 | 69.0–70.0 | 2.5 |
 0.01 | 7926 | 185 | 60.0 | 54.0–65.0 | 7741 | 85.0 | 84.0–85.0 | 3.9 |
 0.05 | 487 | 38 | 12.0 | 9.0–16.0 | 449 | 99.0 | 98.9–99.9 | 13 |
Combined model B | ||||||||
 0.001 | 39,688 | 300 | 97.0 | 95.0–99.0 | 39388 | 22.0 | 22.0–23.0 | 1.3 |
 0.005 | 17,504 | 245 | 79.0 | 74.0–84.0 | 17259 | 66.0 | 65.9–66.9 | 2.3 |
 0.0053 | 16,132 | 239 | 77.0 | 72.0–82.0 | 15893 | 69.0 | 68.0–69.9 | 2.5 |
 0.01 | 7547 | 176 | 57.0 | 51.0–63.0 | 7371 | 85.0 | 85.0–86.0 | 3.9 |
 0.05 | 441 | 27 | 9.0 | 6.0–12.0 | 414 | 99.0 | 98.9–99.9 | 10.7 |
Model C | ||||||||
 0.001 | 40,546 | 301 | 97.0 | 95.0–99.0 | 40,245 | 21.0 | 20.0–21.0 | 1.2 |
 0.005 | 20,478 | 256 | 83.0 | 78.0–87.0 | 20,222 | 60.0 | 60.0–61.0 | 2.1 |
 0.0053 | 16,738 | 238 | 77.0 | 72.0–82.0 | 16,500 | 68.0 | 67.0–68.9 | 2.4 |
 0.01 | 8936 | 190 | 61.0 | 56.0–67.0 | 8746 | 83.0 | 82.0–83.0 | 3.6 |
 0.05 | 360 | 22 | 7.0 | 5.0–11.0 | 338 | 99.0 | 89.9–99.9 | 10.7 |