TABLE 5.
Comparison of characteristics of contacts with tuberculosis according to low and high pathogenicities
| Characteristic | Low pathogenicity (n = 28) | High pathogenicity (n = 75) | P value |
|---|---|---|---|
| Mean (SD) age (yr) | 43.5 (13.1) | 35.5 (19.1) | 0.13 |
| No. (%) of subjects | |||
| Female | 4 (14.3) | 26 (34.7) | 0.04 |
| Male | 24 (85.7) | 49 (65.3) | |
| Group 1 | 2 (7.1) | 12 (16.0) | 0.40 |
| Group 2 | 18 (64.3) | 51 (68.0) | 0.72 |
| Group 3 | 8 (28.6) | 12 (16.0) | 0.15 |
| Asian | 4 (14.3) | 3 (4.8)a | 0.25 |
| Black | 7 (25.0) | 28 (44.4) | 0.08 |
| Hispanic | 5 (17.9) | 4 (6.3) | 0.19 |
| Whiteb | 12 (42.9) | 28 (44.4) | 0.89 |
| Other | |||
| HIV positive | 10 (35.7) | 33 (52.4)a | 0.15 |
| HIV negativec | 18 (64.9) | 30 (47.6) | |
| Ever smear positive | 12 (42.9) | 23 (36.5)a | 0.57 |
| Always smear negative | 14 (50.0) | 25 (39.7) | 0.36 |
| Fewer than three sputum smears | 2 (7.1) | 15 (23.8) | 0.06 |
| Foreign-born | 7 (25.0) | 6 (9.5)a | 0.10 |
| U.S.-born | 21 (75.0) | 57 (90.5) |
a
Denominator was 63 due to missing values for 12 patients who had active tuberculosis at the time of contact investigation and who were referred out of jurisdiction after follow-up.
b
Includes one patient of unknown race or ethnicity.
c
Includes subjects whose HIV status is unknown.