Univariable logistic regression analysis for predictive variables of LTBI (n=109).
| Infected/ Total | % | OR | 95% CI | P values | |
| Gender | |||||
| Male | 29/51 | 56.9 | Ref | ||
| Female | 35/58 | 60.3 | 1.15 | 0.54 to 2.48 | 0.713 |
| Age* (years) | |||||
| <5 | 16/34 | 47.1 | Ref | ||
| ≥5 | 48/75 | 64.0 | 2.00 | 0.88 to 4.55 | 0.098 |
| District where the contact lives | |||||
| Yerevan | 19/31 | 61.3 | 1.16 | 0.50 to 2.72 | 0.731 |
| Other | 45/78 | 57.7 | Ref | ||
| BCG vaccination scar | |||||
| No | 35/62 | 56.5 | Ref | ||
| Yes | 29/47 | 61.7 | 1.24 | 0.57 to 2.69 | 0.582 |
| Number of rooms in the household† | |||||
| ≤4 | 61/93 | 65.6 | 7.87 | 2.07 to 29.97 | 0.002 |
| >4 | 3/16 | 18.8 | Ref | ||
| Number of bedrooms‡ | |||||
| ≤3 | 59/103 | 57.3 | Ref | ||
| >3 | 5/6 | 83.3 | 3.73 | 0.42 to 33.06 | 0.237 |
| Number of people in the household | |||||
| ≤7 | 54/97 | 55.7 | Ref | ||
| >7 | 10/12 | 83.3 | 3.98 | 0.83 to 19.14 | 0.085 |
| Household density§ | |||||
| <1.5 person per room | 15/37 | 40.5 | Ref | ||
| ≥1.5 person per room | 49/72 | 68.1 | 3.12 | 1.37 to 7.11 | 0.007 |
| Sleeps in same house as index case | |||||
| No | 9/24 | 37.5 | Ref | ||
| Yes | 55/85 | 64.7 | 3.06 | 1.20 to 7.81 | 0.020 |
| Sleeps in same room as index case | |||||
| No | 45/78 | 57.7 | Ref | ||
| Yes | 19/31 | 61.3 | 1.16 | 0.50 to 2.72 | 0.731 |
| Relationship with index case | |||||
| Infant or sibling | 46/65 | 70.8 | 3.50 | 1.56 to 7.82 | 0.002 |
| Other | 18/44 | 40.9 | Ref | ||
| Daily exposure to index case | |||||
| No | 7/17 | 41.2 | Ref | ||
| Yes | 57/92 | 62.0 | 2.33 | 0.81 to 6.67 | 0.116 |
| TST done previously | |||||
| No | 21/51 | 41.2 | |||
| Yes | 43/58 | 74.1 | 4.10 | 1.82 to 9.21 | 0.001 |
| Index case age¶ (years) | |||||
| <30 | 7/21 | 33.3 | 0.12 | 0.04 to 0.37 | <0.001 |
| 30–50 | 46/57 | 80.7 | Ref | ||
| >50 | 11/31 | 35.5 | 0.13 | 0.05 to 0.35 | <0.001 |
| Index case smear result** | |||||
| Negative | 14/39 | 35.9 | Ref | ||
| <++ | 13/19 | 68.4 | 3.87 | 1.20 to 12.44 | 0.023 |
| ++/+++ | 37/51 | 72.5 | 4.72 | 1.92 to 11.58 | 0.001 |
| Index case with lung cavities | |||||
| No | 5/14 | 35.7 | Ref | ||
| Yes | 59/95 | 62.1 | 2.95 | 0.92 to 9.50 | 0.070 |
| Index case with cough | |||||
| No | 11/22 | 50.0 | Ref | ||
| Yes | 53/87 | 60.9 | 1.56 | 0.61 to 3.99 | 0.355 |
| Index case previously treated for TB | |||||
| Yes | 15/35 | 42.9 | Ref | ||
| No | 49/74 | 66.2 | 2.61 | 1.15 to 5.96 | 0.022 |
| Index case resistance pattern | |||||
| None to MDR | 18/31 | 58.1 | |||
| MDR | 45/75 | 60.0 | 1.08 | 0.46 to 2.53 | 0.854 |
| Child exposed to other TB cases | |||||
| No | 59/103 | 57.3 | Ref | ||
| Yes | 5/6 | 83.3 | 3.73 | 0.42 to 33.06 | 0.237 |
OR; Unadjusted OR.
p - v a l u e s < 0 . 0 0 5 i n b o l d .
*P for trend: 0.111; †p trend: 0.149; ‡p trend: 0.932; §p trend: 0.430; ¶p trend: 0.101; **p trend: 0.001.
BCG, bacille calmette- Guerin; LTBI, latent TB infection; MDR, multidrug-resistant; ref, reference; TB, tuberculosis; TST, tuberculin skin test.