Table 2.
Demographic Data and TST and IGRA Results of the Study Participants at Baseline Screening
| All Included Contacts [n (%)*] | Prevalent TB Disease [n (%)*] | TB Infection [n (%)*] | TB-Exposed and Uninfected [n (%)*] | |
|---|---|---|---|---|
| Total, according to final outcome | 392 (100) | 48 (12.2) | 105 (26.8) | 239 (60.9) |
| Age, median (IQR), yr | 6 (2.5–11) | 4.5 (2–12) | 8 (5–11) | 5 (2–10) |
| Age | ||||
| <1 yr | 39 (9.9) | 3 (6.2) | 4 (3.8) | 32 (13.4) |
| 1–2 yr | 31 (7.9) | 5 (10.4) | 2 (1.9) | 24 (10.0) |
| >2 yr | 322 (82.1) | 40 (83.3) | 99 (94.2) | 183 (76.6) |
| Sex | ||||
| Male | 200 (51.0) | 25 (52.0) | 51 (48.6) | 124 (51.9) |
| Female | 192 (49.0) | 23 (48.0) | 54 (51.4) | 115 (48.1) |
| Place of birth | ||||
| United Kingdom | 320 (81.7) | 36 (75.0) | 82 (78.0) | 202 (84.5) |
| Abroad | 72 (18.3) | 12 (25.0) | 23 (21.9) | 37 (15.5) |
| Previously BCG-vaccinated | 281 (71.6) | 29 (60.4) | 69 (65.7) | 183 (75.7) |
| TST | ||||
| Positive | 131 (33.4) | 36 (75.0) | 74 (70.4) | 21 (8.8) |
| Negative | 261 (66.6) | 12 (25.0) | 31 (29.5) | 218 (91.2) |
| IGRA | ||||
| Positive | 120 (30.6) | 40 (83.3) | 80 (76.1) | 0 (0) |
| Negative | 258 (65.8) | 7 (14.6) | 21 (20.0) | 230 (96.2) |
| Indeterminate | 14 (3.6) | 1 (2.1) | 4 (3.9) | 9 (3.8) |
Definition of abbreviations: BCG = bacillus Calmette-Guérin; IQR = interquartile range; IGRA = IFN-γ release assay; TB = tuberculosis; TST = tuberculin skin test.
Participants are classified according to final outcome category.
*
Unless otherwise indicated.