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Understanding the TB Cohort Review Process: Instruction Guide 2006

Appendix A: Answers to Exercises

Answers to Exercise 6
Calculation of Indices/Rates for Treatment of TB Disease

1. Index of treatment completion:

         a       x 100 =     26    = 26 = .65 x 100 = 65%
Total cases – (c + d + e) 43 – (1+2+0) 40

2. Index of possible treatment completion:

         a       x 100 =     26    = 26 = .703 x 100 = 70.3%
Total cases – (c + d + e + f + g + h) 43 – (1+2+0+1+0+2) 37

3. Index of likely to complete treatment:

         a + b       x 100 =     26+ 8     = 34 = .919 x 100 = 91.9%
Total cases – (c + d + e + f + g + h) 43 – (1+2+0+1+0+2) 37

4. Death rate:

         d + h       x 100 =     2 +2    = 4 = .095 x 100 = 9.5%
Total cases – (c + e) 43 – (1+0) 42

5. Default rate:

         k       x 100 =     1    = 1 = .024 x 100 = 2.4%
Total cases – (c + e) 43 – (1+0) 42

6. Cohort failure rate:

         i + k       x 100 =     1+ 1     = 2 = .048 x 100 = 4.8%
Total cases – (c + e) 43 – (1+0) 42

 

Answers to Exercise 7
Calculation of Indices for Contact Investigation

1. Cohort failure rate:

    # of contacts identified      = 294 = 7
# of pulmonary cases 42

2. Percent smear positive cases with >0 contacts identified:

    # smear positive cases with # identified >0      = 19 = .95 x 100 = 95%
# smear positive cases 20

3. Percent contacts of smear positive cases evaluated:

    # contacts of smear positive cases evaluated      = 182 = .90 x 100 = 90.1%
# contacts of smear positive cases 202

4. Percent contacts of smear positive cases completing treatment for LTBI:

    # contacts of smear positive cases comp. trtmt for LTBI      = 10 = .217 x 100 = 21.7%
# contacts of smear positive cases started trtmt for LTBI 46

 

 


Released October 2008
Centers for Disease Control and Prevention
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