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

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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