Table 6 Median number of patients classified correctly or misclassified under each decision rule for diagnosis of Latent Tuberculosis Infection (LTBI)
Decision Rule | Classified correctly | Misclassified | Incremental value compared to LTBI if TST + (%) | ||||
|---|---|---|---|---|---|---|---|
| Â | TP (%) | TN (%) | Total | FN (%) | FP (%) | Total | Â |
India study (n = 719) | |||||||
LTBI if TST+ | 280 (39) | 331 (46) | 611 (85) | 100 (14) | 8 (1) | 108 (15) | - |
LTBI if TST + and QFT+ | 223 (31) | 335 (47) | 558 (78) | 158 (21) | 3 (1) | 161 (22) | -7 |
LTBI if TST + or QFT+ | 347 (48) | 326 (46) | 673 (94) | 33 (4) | 13 (2) | 46 (6) | 9 |
Portugal study (n = 1218) | |||||||
LTBI if TST+ | 504 (41) | 245 (20) | 749 (61) | 70 (6) | 399 (33) | 469 (39) | - |
LTBI if TST + and QFT+ | 361 (30) | 634 (52) | 995 (82) | 213 (17) | 10 (1) | 223 (18) | 21 |
LTBI if TST + or QFT+ | 528 (43) | 243 (20) | 771 (63) | 46 (4) | 401 (33) | 447 (37) | 2 |