Table 1.
Characteristics of Study Participants (N = 9814)
| Characteristic | No. (%) |
|---|---|
| Sex | |
| Female | 4868 (49.6) |
| Male | 4946 (50.4) |
| Mean age, year (SD) | 9.4 (1.6) |
| Parental educationa | |
| University/polytechnic | 1881 (19.2) |
| Secondary school or lower | 7933 (80.8) |
| Type of residence | |
| Centrally heated | 2365 (24.1) |
| Not centrally heated | 3774 (38.5) |
| Ger (yurt) | 3675 (37.4) |
| Mean monthly household income, US dollars (SD)b | 840 (580) |
| Home ownership | |
| No | 2114 (21.5) |
| Yes | 7700 (78.5) |
| No. of people per room, mean (SD) | 4.7 (1.3) |
| No. of people in household smoking indoors | |
| 0 | 6252 (63.7) |
| 1 | 3141 (32.0) |
| ≥2 | 421 (4.3) |
| Child actively smoking | |
| No | 9765 (99.5) |
| Yes | 49 (0.5) |
| Household PTB contact | |
| No | 9440 (96.2) |
| Yes | 374 (3.8) |
| Deseasonalized serum 25(OH)Db | |
| <10 ng/mL | 2432 (24.9) |
| ≥10 ng/mL | 7328 (75.1) |
Data are presented as No. (%) otherwise indicated.
Abbreviations: PTB, pulmonary tuberculosis; QFT, QuantiFERON-TB Gold; SD, standard deviation; US, United States.
aHighest educational level attained by either parent.
bData missing for mean monthly household income (n = 10) and serum 25(OH)D (n = 54).