Table 1. Characteristics of household contacts (HHCs) of pulmonary tuberculosis cases and individuals from their source population (SP).
| Characteristic | Index Cases* (n = 366) | Household Contacts (n = 2060) | Source Population (n = 771) | p value† |
| Sex (%) | ||||
| Female | 43.4 | 57.2 | 55.7 | |
| Male | 56.6 | 42.8 | 44.3 | 0.519 |
| Age (years) | ||||
| Median (IQR) (%) | 36 (24–50) | 22 (10–42) | 22 (11–46) | |
| ≤4 | 0.0 | 11.5 | 11.1 | |
| 5–14 | 0.0 | 24.5 | 23.2 | |
| 15–24 | 25.1 | 18.6 | 18.1 | |
| 25–49 | 49.7 | 28.5 | 27.0 | |
| 50–64 | 16.9 | 10.3 | 15.5 | |
| ≥65 | 8.2 | 6.6 | 5.0 | 0.295 |
| Socioeconomic Stratum (%) ‡ | ||||
| −1 | 16.2 | 16.3 | 18.9 | |
| −2 | 47.2 | 51.7 | 54.8 | |
| −3 | 32.7 | 28.4 | 26.1 | |
| −4 | 2.8 | 2.8 | 0.1 | |
| −5 | 0.8 | 0.7 | 0.0 | |
| −6 | 0.3 | 0.1 | 0.0 | 0,001 |
| BCG scar (%) | ||||
| Yes | 72.2 | 78.3 | 73.5 | |
| No | 27.8 | 21.7 | 26.5 | 0.008 |
| History of tuberculosis prior to study (%) | ||||
| Yes | 10.1 | 2.5 | 0.8 | |
| No | 89.9 | 97.5 | 99.2 | 0.006 |
*Only index cases that lead to household contacts included.
†p value (two tailed) refers to comparison of characteristics in HHCs and individuals from SP.
‡SES categories as defined in Methods.