Table 1.
Baseline characteristics of the study population.
| Uninfected | LTBI | Active TB | |
|---|---|---|---|
| (n = 61) | (n = 15) | (n = 6) | |
| Median (IQR) age, years | 5.7 | 11.7 | 15.0 |
| (2.8–10.8) | (5.6–14.4) | (12.1–16.2) | |
| Ethnic origin, no. (%) | |||
| Africa | 27 (44.3) | 10 (66.7) | 5 (83.3) |
| Asia | 19 (31.1) | 4 (26.7) | 1 (16.7) |
| Middle East | 4 (6.6) | 0 | 0 |
| Australia/New Zealand | 11 (18.0) | 1 (6.7) | 0 |
| Migration background *, no. (%) | 28 (45.9) | 14 (93.3) | 6 (100) |
| Median (IQR) duration of residence in Australia (migrants only *), months | 7.0 (2.3–36.0) |
12.5 (4.0–37.3) |
21.0 (3.0–69.0) |
| BCG vaccination history, no. (%) | |||
| Yes | 21 (34.4) | 13 (86.7) | 5 (83.3) |
| No | 37 (60.6) | 1 (6.7) | 1 (16.7) |
| Unknown | 3 (4.9) | 1 (6.7) | 0 |
| BCG vaccination scar, no. (%) | |||
| Yes | 20 (32.8) | 11 (73.3) | 5 (83.3) |
| No | 41 (67.2) | 4 (26.7) | 1 (16.7) |
| Known TB contact, no. (%) | |||
| Yes | 42 (68.9) | 7 (46.7) | 1 (16.7) |
| No | 19 (31.1) | 8 (53.3) | 5 (83.3) |
| Type of TB contact, no. (%) | |||
| Parent | 10 (16.4) | 3 (20.0) | 1 (16.7) |
| Other household member | 20 (32.8) | 3 (20.0) | 0 |
| Other contact | 12 (19.7) | 1 (6.7) | 0 |
| No known contact | 19 (31.1) | 8 (53.3) | 5 (83.3) |
BCG, Bacillus Calmette-Guérin; IQR, interquartile range; LTBI, latent tuberculosis infection; TB, tuberculosis.
*
Excludes migrants from New Zealand.