Table 1. Characteristics of TB case contacts who were negative by tuberculin test and ELISPOT at recruitment and those who had a repeat skin test at 3 months.
| Characteristic | Recruitment (n = 973) | 3 months (n = 704) |
| Mean (median: range) age (years) | 19.0 (15:0.5–89) | 17.7 (13:0.5–89) |
| 0.5–5 | 164 (16.9%) | 138 (19.6%) |
| 6–15 | 352 (36.2%) | 275 (39.6%) |
| 16–30 | 299 (30.7%) | 187 (26.6%) |
| >30 | 158 (16.2%) | 104 (14.8%) |
| Male (%) | 455 (46.8%) | 324 (46.0%) |
| Ethnic group | ||
| Mandinka | 352 (36.2%) | 269 (38.2%) |
| Jola | 242 (24.9%) | 160 (22.7%) |
| Wolof | 138 (14.2%) | 99 (14.1%) |
| Fula | 58 (6.0%) | 47 (6.7%) |
| Other | 183 (18.8%) | 129 (18.3%) |
| Proximity to case (%) | ||
| Same room | 163 (16.8%) | 109 (15.5%) |
| Different room | 458 (47.1%) | 338 (48.0%) |
| Different house | 352 (36.2%) | 257 (36.5%) |
| BCG scar present | 406 (41.7%)a | 289 (41.1%)c |
| HIV positive | 25 (2.6%)b | 19 (2.7%)d |
a
135 (13.9%) had uncertain scar status, b n = 960 tested, c 101 (14.4%) had uncertain scar status, d n = 693 tested.