Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options
CDC Home

Understanding the TB Cohort Review Process: Instruction Guide (2006)

Return Table of Contents

Appendix A: Answers to Exercises


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

1. Index of treatment completion:

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

2. Index of possible treatment completion:

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

5. Default rate:

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

6. Cohort failure rate:

i + kx 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 cases42

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

# smear positive cases with # identified >0=19=.95 x 100 = 95%
# smear positive cases20

3. Percent contacts of smear positive cases evaluated:

# contacts of smear positive cases evaluated=182=.90 x 100 = 90.1%
# contacts of smear positive cases202

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 LTBI46

 
Contact Us:
  • Centers for Disease Control and Prevention
    Division of Tuberculosis Elimination (DTBE)
    1600 Clifton Rd., NE
    MS E10
    Atlanta, GA 30329
  • 800-CDC-INFO
    (800-232-4636)
    TTY: (888) 232-6348
  • Contact CDC–INFO
  • Page last reviewed: September 1, 2012
  • Page last updated: September 1, 2012
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30329-4027, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC-INFO