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Table 1 Participant characteristics (n = 938)

From: Risk factors for active tuberculosis in 938 QuantiFERON-positive schoolchildren in Mongolia: a community-based cross-sectional study

Characteristic

Number (%)/Mean (s.d.)

Mean age, years (s.d.)

9.8 (1.6)

Sex

Female, n (%)

490 (52.2)

Male, n (%)

448 (47.8)

Parental education(a)

University/polytechnic, n (%)

127 (13.5)

Secondary school or lower, n (%)

811 (86.5)

Type of residence

Centrally heated, n (%)

167 (17.8)

Not centrally heated, n (%)

373 (39.8)

Ger (Yurt), n (%)

398 (42.4)

Mean monthly household income, US dollars (s.d.)(b)

779 (592)

Home ownership

No, n (%)

220 (23.5)

Yes, n (%)

718 (76.5)

Mean number of people/room (s.d.)(b)

3.5 (1.8)

No. of smokers in household(c)

0

530 (56.5)

1 or more

408 (43.5)

Child actively smoking

No, n (%)

936 (99.8)

Yes, n (%)

2 (0.2)

BCG scar

Absent

193 (20.6)

 

Present

745 (79.4)

Mean body mass index, kg/m2 (s.d.)

 

17.1 (2.8)

Mean % body fat(c) (s.d.)

 

17.7 (6.1)

Household PTB contact

No, n (%)

780 (83.2)

Yes, n (%)

158 (16.8)

De-seasonalized serum 25(OH)D(b)

< 10 ng/ml, n (%)

281 (30.1)

≥10 ng/ml, n (%)

652 (69.9)

  1. Abbreviations: 25(OH) D, 25-hydroxyvitamin D; PTB, pulmonary tuberculosis; s.d., standard deviation; US, United States. ahighest educational level attained by either parent; bmissing values (income, 8 missing; number of people per room, 1 missing; 25OHD, 5 missing); cDefined as a household member other than the participating child smoking tobacco indoors