| Background | Effective (n: 91) | Percentage | ||
| Family history of chronic cough | No | 81 | 89 | |
| Yes | Mother | 4 | 4.4 | |
| Father | 4 | 4.4 | ||
| Other member | 2 | 2.2 | ||
| Family history of documented TB disease | No | 81 | 89 | |
| Yes | Mother | 4 | 4.4 | |
| Father | 3 | 3.3 | ||
| Other member | 3 | 3.3 | ||
| Concept of tuberculosis contagion | No | 70 | 76.9 | |
| Yes | Mother | 11 | 12.1 | |
| Father | 5 | 5.5 | ||
| Other member | 5 | 5.5 | ||