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| Reasons | Percentage (%) |
| Previous positive TST results | 70.2 |
| Worried about positive reaction | 31.9 |
| Did TST in the past 3 months | 16.0 |
| Anxious about psychological burden | 16.0 |
| Requirement for two visits | 9.6 |
| Think oneself can't be infected | 4.3 |
