Summary statistics for results of QuantiFERON-TB Gold In-tube
| Stratification | Number of persons | Cut-off for positivity (%) | Cut-off for positivity (%) |
|---|---|---|---|
| 2416 | LTBI (QFT-IT ≥0.35 IU/ml) | Recent LTBI (QFT-IT ≥0.7 IU/ml) | |
| Age (years) | N (%) | ||
| 18–24 | 178 | 15 (8) | 12 (7) |
| 25–34 | 955 | 141 (15) | 98 (10) |
| 35–44 | 753 | 205 (27) | 161 (21) |
| 45–54 | 389 | 163 (42) | 130 (33) |
| 55–64 | 105 | 50 (48) | 41 (39) |
| ≥65 | 36 | 20 (56) | 18 (50) |
| χ2 p Value | <0.001 | <0.001 | |
| Age (years) | |||
| 18–34 | 1133 | 156 (14) | 110 (10) |
| 35–54 | 1142 | 368 (32) | 291 (25) |
| ≥55 | 141 | 70 (50) | 59 (42) |
| <0.001* | <0.001* | ||
| BCG scar number | 2406 | N (%) | |
| No inoculation | 216 | 102 (47) | 86 (40) |
| Inoculation once | 1062 | 271 (26) | 216 (20) |
| Booster | 1128 | 218 (19) | 155 (14) |
| <0.001* | <0.001* | ||
| Controlling for age | <0.001† | <0.001† | |
| 18–34 years | N (%) | ||
| No inoculation | 65 | 12 (18) | 10 (15) |
| Inoculation once | 563 | 93 (17) | 66 (12) |
| Booster | 504 | 51 (10) | 34 (7) |
| p=0.002* | p=0.002* | ||
| 35–54 years | |||
| No inoculation | 101 | 60 (59) | 48 (48) |
| Inoculation once | 446 | 150 (34) | 129 (29) |
| Booster | 587 | 155 (26) | 111 (19) |
| p<0.001* | p<0.001* | ||
| ≥55 years | |||
| No inoculation | 50 | 30 (60) | 28 (56) |
| Inoculation once | 53 | 28 (53) | 21 (40) |
| Booster | 37 | 12 (32) | 10 (27) |
| p=0.013* | p=0.006* | ||
*Cochran–Armitage trend test.
†Cochran–Mantel–Haenszel statistics for stratification analysis.
LTBI, latent TB infection.