Summary statistics for the double positive results (QuantiFERON-TB Gold In-tube and TST) and the analysis for concordance between the two tests
| Age | ||||
|---|---|---|---|---|
| 18–34 years | 35–54 years | ≥55 years | p Value | |
| 1126 | 1122 | 137 | ||
| N (%) | ||||
| TST ≥10 mm and QFT-IT ≥0.35 IU/ml | κ Value: 0.090 | |||
| Agreement: 40% | ||||
| Positive | 142 (13) | 344 (31) | 64 (47) | <0.001* |
| No inoculation | 9 (14) | 53 (54) | 27 (55) | <0.001† |
| Inoculation once | 84 (15) | 144 (33) | 25 (48) | |
| Booster | 49 (10) | 147 (25) | 12 (33) | |
| TST ≥15 mm and QFT-IT ≥0.35 IU/ml | κ Value: 0.202 | |||
| Agreement: 62% | ||||
| Positive | 100 (9) | 244 (22) | 35 (26) | <0.001* |
| No inoculation | 7 (11) | 41 (42) | 19 (39) | <0.001† |
| Inoculation once | 64 (11) | 103 (23) | 9 (17) | |
| Booster | 29 (6) | 100 (17) | 7 (19) | |
| TST ≥18 mm and QFT-IT ≥0.35 IU/ml | κ Value: 0.224 | |||
| Agreement: 74% | ||||
| Positive | 42 (4) | 125 (11) | 21 (15) | <0.001* |
| No inoculation | 3 (5) | 26 (27) | 9 (18) | <0.001† |
| Inoculation once | 26 (5) | 49 (11) | 8 (15) | |
| Booster | 13 (3) | 50 (9) | 4 (11) | |
| TST ≥10 mm and QFT-IT ≥0.7 IU/ml | κ Value: 0.070 | |||
| Agreement: 35% | ||||
| Positive | 101 (9) | 273 (24) | 54 (39) | <0.001* |
| No inoculation | 9 (14) | 43 (44) | 25 (51) | <0.001† |
| Inoculation once | 59 (11) | 124 (28) | 19 (37) | |
| Booster | 33 (7) | 106 (18) | 10 (28) | |
| TST ≥15 mm and QFT-IT ≥ 0.7 IU/ml | κ Value: 0.197 | |||
| Agreement: 62% | ||||
| Positive | 79 (7) | 202 (18) | 33 (24) | <0.001* |
| No inoculation | 7 (11) | 35 (36) | 19 (39) | <0.001† |
| Inoculation once | 47 (8) | 92 (21) | 7 (13) | |
| Booster | 25 (5) | 75 (13) | 7 (19) | |
| TST ≥18 mm and QFT-IT ≥0.7 IU/ml | κ Value: 0.243 | |||
| Agreement: 78% | ||||
| Positive | 37 (3) | 106 (9) | 19 (14) | <0.001* |
| No inoculation | 3 (5) | 22 (22) | 9 (18) | <0.001† |
| Inoculation once | 21 (4) | 44 (10) | 6 (12) | |
| Booster | 13 (3) | 40 (7) | 4 (11) | |
†Cochran–Mantel–Haenszel statistics for stratification analysis.
*Pearson χ2 for N×N tables.
TST, tuberculin skin test.