TABLE 1.
CHARACTERISTICS OF STUDY PARTICIPANTS (N = 1978)
| Characteristic | Number* | Percent (%) |
| Sex | ||
| Male | 1,294 | 65.5 |
| Female | 681 | 34.5 |
| Age (SD) | 1,974 | 21.8 yr (4.6 yr) |
| Race or ethnic group† | ||
| White | 1,298 | 65.6 |
| Black | 459 | 23.2 |
| Hispanic | 221 | 11.4 |
| Asian/Pacific Islander | 117 | 5.7 |
| Other | 63 | 3.2 |
| Prevalence of TB in country of birth | ||
| <20 per 100,000 | 1,873 | 94.7 |
| 20–100 per 100,000 | 35 | 1.8 |
| >100 per 100,000 | 70 | 3.5 |
| BCG vaccinated | 69 | 3.5 |
| Greatest prevalence of TB among countries the subject lived in or traveled to for >1 mo | ||
| <20 per 100,000 | 1,811 | 91.6 |
| 20–100 per 100,000 | 62 | 3.1 |
| >100 per 100,000 | 105 | 5.3 |
| Contact with someone with TB | ||
| In same household | 24 | 1.2 |
| Casual contact | 73 | 3.7 |
| Healthcare work | 232 | 11.7 |
| Lived or worked in congregate setting | 120 | 6.1 |
| Farm work or residence | 383 | 19.4 |
| Current residence | ||
| Northeast United States | 337 | 17 |
| Southeast United States | 657 | 33.2 |
| Western United States | 706 | 35.7 |
| Other | 278 | 14.1 |
| Smoking | ||
| Never | 1,480 | 75.1 |
| <1 pack per day | 395 | 20 |
| 1+ pack per day | 97 | 4.9 |
| Education, yr | ||
| <12 | 257 | 13 |
| 12 | 1,095 | 55.4 |
| 13–15 | 468 | 23.7 |
| 16+ | 158 | 8 |
| Prior TB treatment | 45 | 2.3 |
| Prior TB skin test performed | 710 | 35.9 |
| Prior positive skin test | 24 | 3.4 (of those with a prior test) |
| Unknown result | 54 | 7.6 (of those with a prior test) |
Definition of abbreviations: BCG = bacille Calmette-Guérin vaccine; TB = tuberculosis.
*
Some cells do not total to 1,978 because of missing data.
†
Recruits could choose more than one group; other includes 39 American Indian, 8 biracial or multiracial.