Table 1 The clustering status of TB cases by risk factor in England, Wales and Northern Ireland, 2010–2014
| Â | Total cases | Clustered cases (%) | Subsequent cases (% of clustered cases) | First cases (% of clustered cases) |
|---|---|---|---|---|
HIV status | ||||
 Negative | 18,105 | 10,299 (56.9) | 8160 (79.2) | 2139 (20.8) |
 Positive | 759 | 410 (54.0) | 311 (75.9) | 99 (24.1) |
Year of TB notification | ||||
 2010 | 3174 | 1795 (56.6) | 874 (48.7) | 921 (51.3) |
 2011 | 4296 | 2443 (56.9) | 1786 (73.1) | 657 (26.9) |
 2012 | 4327 | 2525 (58.4) | 2150 (85.1) | 375 (14.9) |
 2013 | 3696 | 2130 (57.6) | 1940 (91.1) | 190 (8.9) |
 2014 | 3371 | 1816 (53.9) | 1721 (94.8) | 95 (5.2) |
Sex | ||||
 Female | 7521 | 4153 (55.2) | 3272 (78.8) | 881 (21.2) |
 Male | 11,323 | 6547 (57.8) | 5196 (79.4) | 1351 (20.6) |
 Missing | 20 | 9 (45.0) | 3 (33.3) | 6 (66.7) |
Age (years) | ||||
 15–24 | 3238 | 2059 (63.6) | 1652 (80.2) | 407 (19.8) |
 25–34 | 5632 | 3139 (55.7) | 2453 (78.1) | 686 (21.9) |
 35–44 | 3578 | 2041 (57.0) | 1601 (78.4) | 440 (21.6) |
 45–54 | 2388 | 1423 (59.6) | 1149 (80.7) | 274 (19.3) |
 55–64 | 1488 | 890 (59.8) | 717 (80.6) | 173 (19.4) |
 65+ | 2540 | 1157 (45.6) | 899 (77.7) | 258 (22.3) |
Ethnicity | ||||
 White | 3991 | 2442 (61.2) | 1959 (80.2) | 483 (19.8) |
 Black African | 3211 | 2031 (63.3) | 1603 (78.9) | 428 (21.1) |
 Black Other | 588 | 458 (77.9) | 391 (85.4) | 67 (14.6) |
 Indian sub-continent | 8079 | 4198 (52.0) | 3300 (78.6) | 898 (21.4) |
 Mixed/other | 2525 | 1330 (52.7) | 1029 (77.4) | 301 (22.6) |
 Missing | 470 | 250 (53.2) | 189 (75.6) | 61 (24.4) |
Time since entry to the UK | ||||
 UK born | 4431 | 3000 (67.7) | 2495 (83.2) | 505 (16.8) |
 Within 2 years | 2535 | 1313 (51.8) | 979 (74.6) | 334 (25.4) |
 2–5 years | 2999 | 1509 (50.3) | 1154 (76.5) | 355 (23.5) |
 5–10 years | 2743 | 1485 (54.1) | 1149 (77.4) | 336 (22.6) |
 More than 10 years | 4115 | 2329 (56.6) | 1870 (80.3) | 459 (19.7) |
 Missing | 2041 | 1073 (52.6) | 824 (76.8) | 249 (23.2) |
TB lineage | ||||
 Beijing | 1041 | 770 (74.0) | 667 (86.6) | 103 (13.4) |
 Euro-American | 7313 | 4300 (58.8) | 3352 (78.0) | 948 (22.0) |
 Central Asian Strain | 5280 | 3285 (62.2) | 2674 (81.4) | 611 (18.6) |
 East Asian Indian | 2674 | 1046 (39.1) | 769 (73.5) | 277 (26.5) |
 Other/unknown | 2554 | 1306 (51.1) | 1008 (77.2) | 298 (22.8) |
 Missing | 2 |  |  |  |
IMD decile | ||||
 1 | 3933 | 2360 (60.0) | 1868 (79.2) | 492 (20.8) |
 2 | 3645 | 2130 (58.4) | 1678 (78.8) | 452 (21.2) |
 3 | 3008 | 1704 (56.6) | 1334 (78.3) | 370 (21.7) |
 4 | 2301 | 1314 (57.1) | 1066 (81.1) | 248 (18.9) |
 5 | 1655 | 906 (54.7) | 695 (76.7) | 211 (23.3) |
 6 | 1183 | 652 (55.1) | 516 (79.1) | 136 (20.9) |
 7 | 838 | 453 (54.1) | 375 (82.8) | 78 (17.2) |
 8 | 728 | 398 (54.7) | 302 (75.9) | 96 (24.1) |
 9 | 610 | 307 (50.3) | 241 (78.5) | 66 (21.5) |
 10 | 474 | 243 (51.3) | 194 (79.8) | 49 (20.2) |
 Missing | 489 | 242 (49.5) | 202 (83.5) | 40 (16.5) |
Drug misuse | ||||
 No | 16,536 | 9241 (55.9) | 7291 (78.9) | 1950 (21.1) |
 Yes | 702 | 551 (78.5) | 473 (85.8) | 78 (14.2) |
 Missing | 1626 | 917 (56.4) | 707 (77.1) | 210 (22.9) |
Alcohol misuse | ||||
 No | 16,260 | 9160 (56.3) | 7251 (79.2) | 1909 (20.8) |
 Yes | 776 | 528 (68.0) | 441 (83.5) | 87 (16.5) |
 Missing | 1828 | 1021 (55.9) | 779 (76.3) | 242 (23.7) |
Homelessness | ||||
 No | 16,771 | 9480 (56.5) | 7500 (79.1) | 1980 (20.9) |
 Yes | 666 | 449 (67.4) | 372 (82.9) | 77 (17.1) |
 Missing | 1427 | 780 (54.7) | 599 (76.8) | 181 (23.2) |
Imprisonment | ||||
 No | 16,210 | 9097 (56.1) | 7200 (79.1) | 1897 (20.9) |
 Yes | 649 | 484 (74.6) | 410 (84.7) | 74 (15.3) |
 Missing | 2005 | 1128 (56.3) | 861 (76.3) | 267 (23.7) |
Site of TB disease/smear status†| ||||
 Pulmonary, smear positive | 4959 | 3137 (63.3) | 2448 (78.0) | 689 (22.0) |
 Pulmonary, smear negative/unknown | 6952 | 4084 (58.7) | 3279 (80.3) | 805 (19.7) |
 Extra-pulmonary | 6947 | 3486 (50.2) | 2742 (78.7) | 744 (21.3) |
 Missing | 6 | 2 (33.3) | 2 (100.0) | 0 (0.0) |