Characteristic | Population at risk at start of contact nvestigation n | Total TB cases n (%) | Prevalence of TB at time of initial contact screening# | Risk for incidence of TB 3 months to 2 years after initial screening¶ | Incidence of TB 3 months to 2 years after initial screening¶ | Risk for incidence of TB ≥2 years after initial screening+ | Incidence of TB ≥2 years after initial screening+ | |||||
n | % (95% CI) | Person-years at risk n | Persons at risk n | n | per 100 000 (95% CI) | Person-years at risk n | Persons at risk n | n | per 100 000 (95% CI) | |||
All contacts | 14 371 | 273 (1.9) | 212 | 1.48 (1.26–3.12) | 21 518 | 14 159 | 50 | 232 (174–309) | 40 318 | 14 109 | 11 | 27 (14–50) |
Age years§ | ||||||||||||
0–14 | 2369 | 6 (1.9) | 38 | 1.60 (1.15–2.22) | 3629 | 2331 | 6 | 165 (67–379) | 6232 | 2325 | 2 | 32 (6–129) |
15–34 | 5335 | 128 (2.4) | 98 | 1.84 (1.50–2.24) | 7698 | 5237 | 26 | 338 (225–502) | 15 008 | 5211 | 4 | 27 (9–73) |
≥35 | 5740 | 99 (1.7) | 76 | 1.32 (1.05–1.66) | 8830 | 5664 | 18 | 204 (125–329) | 17 362 | 5646 | 5 | 29 (11–71) |
Sexƒ,## | ||||||||||||
Male | 6125 | 123 (2.0) | 102 | 1.67 (1.37–2.03) | 9131 | 6023 | 19 | 208 (129–331) | 17 260 | 6004 | 2 | 12 (2–47) |
Female | 7475 | 149 (2.0) | 109 | 1.46 (1.20–1.76) | 11 205 | 7366 | 31 | 277 (191–398) | 21 677 | 7335 | 9 | 42 (20–82) |
TB incidence (per 100 000) in country of birth¶¶ | ||||||||||||
Australian-born <10 per 100 000 | 5357 | 46 (0.9) | 39 | 0.73 (0.53–1.00) | 8033 | 5318 | 6 | 75 (30–171) | 16 287 | 5312 | 1 | 6 (0.3–40) |
Overseas-born <10 per 100 000 | 641 | 15 (2.3) | 11 | 1.72 (0.90–3.15) | 969 | 630 | 3 | 310 (80–982) | 1979 | 627 | 1 | 51 (3–327) |
Overseas-born 10–99 per 100 000 | 2800 | 74 (2.6) | 59 | 2.11 (1.62–2.73) | 4240 | 2741 | 14 | 330 (188–568) | 8005 | 2727 | 1 | 12 (1–81) |
Overseas-born >100 per 100 000 | 3245 | 138 (4.3) | 103 | 3.17 (2.61–3.85) | 4763 | 3142 | 27 | 567 (381–836) | 8488 | 3115 | 8 | 94 (44–194) |
TST size++,§§ | ||||||||||||
TST ≥10 mm (including results prior to contact investigation) | 4307 | N/A | N/A | 6635 | 4307 | 32 | 482 (336–689) | 12 679 | 4275 | 9 | 71 (35–140) | |
TST <10 mm | 8073 | N/A | N/A | 12 247 | 8073 | 4 | 33 (10–90) | 23 269 | 8069 | 0 | ||
TST result unknown or not done | 1779 | N/A | N/A | 2636 | 1779 | 14 | 531 (302–913 ) | 3757 | 1765 | 2 | 53 (9–214) | |
Preventive treatment§§,ƒƒ | ||||||||||||
All preventive treatment received | 548 | N/A | N/A | 858 | 548 | 2 | 233 (40–936) | 1653 | 546 | 1 | 60 (3–392) | |
TST ≥10 mm, preventive treatment received | 409 | N/A | N/A | 633 | 409 | 2 | 316 (55–1266) | 1313 | 407 | 1 | 76 (4–493) | |
TST ≥10 mm, no preventive treatment received | 3942 | N/A | N/A | 6002 | 3942 | 30 | 500 (343–722) | 11 365 | 3912 | 8 | 70 (33–145) |
TST: tuberculin skin test; N/A: not available. #: Includes all TB cases among contacts diagnosed within 90 days of the first healthcare contact for screening; ¶: the denominator is person-years at risk, the 212 contacts who were diagnosed with TB at the time of the initial screening are excluded; +: the denominator is person-years at risk, the 262 contacts who were diagnosed with TB at the initial screening or within the first 2 years of follow-up are excluded; §: data available for n=13 444; ƒ: one contact with TB was classified as “transgender”, thus female and male cases total 272 instead of 273 cases; ##: data available for 13 600; ¶¶: data available for 12 043; ++: data available for 12 417; §§: only includes contacts during follow-up period (without the 212 contacts who were diagnosed with TB at the time of the initial screening); ƒƒ: data available for 14 159.