Table 3. Age-specific agreement of TST and QFT-GIT assays.
| Age | Total (n = 869) |
p Value |
||||
|---|---|---|---|---|---|---|
| <6 (n = 62) |
6–15 (n = 164) |
15–45 (n = 515) |
>45 (n = 128) |
|||
| TST (T+) | ||||||
| Pos. | 24 (39%) | 70 (43%) | 299 (58%) | 85 (66%) | 478 (55%) | <0.001 |
| Neg. | 38 (61%) | 94 (57%) | 216 (42%) | 43 (34%) | 391 (45%) | |
| QFT-GIT (Q+) | ||||||
| Pos. | 18 (29%) | 65 (40%) | 299 (58%) | 86 (67%) | 468 (54%) | <0.001 |
| Neg. | 44 (71%) | 99 (60%) | 216 (42%) | 42 (33%) | 401 (46%) | |
| LTBI (T+ / Q+) | ||||||
| Pos. | 30 (48%) | 93 (57%) | 413 (80%) | 110 (86%) | 646 (74%) | <0.001 |
| Neg. | 32 (52%) | 71 (43%) | 102 (20%) | 18 (14%) | 223 (26%) | |
| Only TST (T+ & Q-) | ||||||
| Yes | 12 (19%) | 28 (17%) | 114 (22%) | 24 (19%) | 178 (21%) | 0.509 |
| No | 50 (81%) | 136 (83%) | 401 (78%) | 104 (81%) | 691 (80%) | |
| Only QFT-GIT (T- & Q+) | ||||||
| Yes | 6 (10%) | 23 (14%) | 114 (22%) | 25 (20%) | 168 (19%) | 0.026 |
| No | 56 (90%) | 141 (86%) | 401 (78%) | 103 (81%) | 701 (81%) | |
| Both (T+ & Q+) | ||||||
| Yes | 12 (19%) | 42 (26%) | 185 (36%) | 61 (48%) | 300 (35%) | <0.001 |
| No | 50 (81%) | 122 (74%) | 330 (64%) | 67 (52%) | 569 (66%) | |
| Agreement | 71% | 69% | 56% | 62% | 60% | |
| Kappa | 0.36 (0.12) Fair |
0.36 (0.07) Fair |
0.09 (0.04) Poor |
0.14 (0.09) Poor |
0.20 (0.03) Poor |
|