Research Article
Infectivity of Mycobacterium tuberculosis Genotypes and Outcome of Contact Investigation in Classroom in Guangxi, China
Table 2
Characteristics of contacts (N=6512) and contact screening outcomes by genotypes of index cases.
| | Variable | Genotype of index case [n (%)] | P-value (Chi-squared Test) | | Unknown (n=5625) | Non-Beijing (n=468) | Beijing (n=419) |
| | School type | | | | | | Middle school | 2156 (88.6) | 82 (3.4) | 196 (8.1) | < 0.001 | | High school | 3469 (85.1) | 386 (9.5) | 223 (5.5) | | | Sex | | | | | | Male | 2788 (85.6) | 231 (7.1) | 237 (7.3) | 0.021 | | Female | 2837 (87.1) | 237 (7.3) | 182 (5.6) | | | Ethnicity | | | | | | Han | 2339 (92.5) | 164 (6.5) | 26 (1.0) | < 0.001 | | Others | 3286 (82.5) | 304 (7.6) | 393 (9.9) | | | BCG scar | | | | | | Absence | 3910 (85.1) | 384 (8.4) | 302 (6.6) | < 0.001 | | Presence | 1715 (89.5) | 84 (4.4) | 117 (6.1) | | | Screening results | | | | | | 0-5 mm | 4623 (86.8) | 407 (7.6) | 298 (5.6) | < 0.001 | | 6-9 mm | 544 (83.8) | 26 (4) | 79 (12.2) | | | 10-14 mm | 238 (84.4) | 18 (6.4) | 26 (9.2) | | | ≥ 15 mm (without TB) | 183 (88) | 10 (4.8) | 15 (7.2) | | | ≥ 15 mm (with TB) | 37 (82.2) | 7 (15.6) | 1 (2.2) | |
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