Characteristics of adult contacts and subgroups included for QFT based longitudinal analyses
| Contacts for QFT based longitudinal analysis (N=1728) | |||||||
|---|---|---|---|---|---|---|---|
| Non-smear positive TB contact (N=1284) | Smear positive TB contact (N=444) | ||||||
| All adult contacts (N=1769) | 16–35 years (N=646) | ≥36 years (N=638) | Sig (p value) | 16–35 years (N=233) | ≥36 years (N=211) | Sig (p value) | |
| Gender | |||||||
| Male (%) | 884 (50.0) | 330 (51.4) | 318 (50.2) | 0.695 | 117 (50.2) | 100 (46.1) | 0.569 |
| Age group (%) | |||||||
| 16–35 years | 885 (50.0) | ||||||
| ≥36 years | 884 (50.0) | ||||||
| Ethnicity (%) | |||||||
| South Asian | 1273 (72.1) | 501 (77.8) | 489 (76.8) | <0.001 | 130 (56.5) | 124 (59.0) | 0.26 |
| Black | 140 (8.0) | 70 (10.9) | 38 (6.0) | 20 (8.7) | 9 (4.3) | ||
| White | 259 (14.6) | 37 (5.7) | 75 (11.8) | 71 (30.9) | 71 (33.8) | ||
| Other | 90 (5.1) | 36 (5.6) | 35 (5.5) | 9 (3.9) | 6 (2.9) | ||
| Origin (%) | |||||||
| Foreign born (%) | 518/876 (59.1) | 231/409 (56.5) | 107/125 (85.6) | <0.001 | 57/165 (34.5) | 100/145 (69.0) | <0.001 |
| Index case disease type (%) | |||||||
| Non-smear positive | 1323 (74.8) | ||||||
| Pulmonary smear positive | 446 (25.2) | ||||||
| Household contact (%) | 910 (51.4) | 367 (56.8) | 361 (56.6) | 0.955 | 79 (33.9) | 84 (39.8) | 0.202 |
| Partner contact (%) | 285 (16.1) | 86 (13.3) | 153 (24.0) | <0.001 | 18 (7.7) | 21 (10.0) | 0.502 |
QFT, QuantiFERON TB Gold-In Tube; TB, tuberculosis.