Methodology:
(1) Children were excluded if they had a previous history of a positive tuberculin test.
(2) Identified children received a Mantoux test using 0.1 mL of 5 Tuberculin Units of PPD applied to the volar aspect of the arm.
(3) The injection site was read at 48 hours later.
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Questions Asked of Parents
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Response
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Points
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Has your child had any contact with a case of TB?
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No
|
0
|
|
|
Yes
|
1
|
|
Was any household member including your child born in or has traveled to areas where TB is common (Africa, Asia, Latin America, Caribbean)?
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No
|
0
|
|
|
Yes
|
1
|
|
Does your child have regular (e.g., daily) contact with adults at high risk for TB (i.e., those who are HIV infected, homeless, incarcerated, and/or illicit drug users)?
|
No
|
0
|
|
|
Yes
|
1
|
|
Does you child have HIV infection?
|
No
|
0
|
|
|
Yes
|
1
|
number of risk factors =
= SUM(points for all 4 questions)
Interpretation:
• minimum number of risk factors: 0
• maximum number of risk factors: 4
• A person with at least 1 risk factor was 35 times more likely to have a positive tuberculin skin test than a person with no risk factors identified.
Performance characteristics:
• sensitivity 85.2%, specificity 86%, negative predictive value 99.8%, positive predictive value 5.4%
