Table 1. IGRA results for prisoners with specific TB incidences in prisons, Tianjin, China*.
| Prison no. | TB incidence† | No. (%) seropositive | No. (%) seronegative | Total | p value |
|---|---|---|---|---|---|
| 1 | 1,945.2 | 106 (60.9) | 68 (39.1) | 174 | <0.01 |
| 2 | 649.9 | 72 (41.9) | 100 (58.1) | 172 | NA |
| 3 | 892.7 | 91 (47.2) | 102 (52.8) | 193 | NA |
| 4 | 944.6 | 129 (57.6) | 95 (42.4) | 224 | NA |
| 5 |
603.0 |
101 (51.5) |
95 (48.5) |
196 |
NA |
| Overall | 1,028.9 | 499 (52.0) | 460 (48.0) | 959 | NA |
*IGRA, interferon-γ release assay; NA, not applicable; TB, tuberculosis. †Reported pulmonary TB incidence (cases/100,000 persons) in the past 5 years was based on annual TB screening and case finding through daily healthcare seeking.