Table 4.
Comparison of screening results between close and general contacts of the index case.
| Factor | Subgroup | Close contacts of the index case (%) | General contacts of the index case (%) | Relative risk | 95% CI | p-value |
|---|---|---|---|---|---|---|
| TST positive rate | ≥5 mm | 25 (78.12%) | 8 (28.57%) | 2.73 | 1.23–6.06 | 0.013 |
| <5 mm | 7 (21.88%) | 20 (71.43%) | ||||
| TST strong positive rate | ≥15 mm | 16 (50.00%) | 4 (14.29%) | 3.50 | 1.17–10.47 | 0.025 |
| <15 mm | 16 (50.00%) | 24 (85.71%) | ||||
| TST latent infection rate | ≥10 mm | 20 (62.50%) | 7 (25.00%) | 2.50 | 1.06–5.91 | 0.037 |
| <10 mm | 12 (37.50%) | 21 (75.00%) | ||||
| IGRA | + | 8 (25.00%) | 3 (10.71%) | 2.33 | 0.62–8.80 | 0.211 |
| − | 24 (75.00%) | 25 (89.29%) | ||||
| Chest CT | Abnormal | 5 (15.63%) | 0 (0.00%) | 5.88 | 0.80 to +infinity | 0.086 |
| Normal | 27 (84.37%) | 28 (100.00%) |
TST, tuberculin skin testing; IGRA, interferon-gamma release assay. p < 0.05.