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Table 2 Impact of LQAS classification systems

From: Improving data quality and supervision of antiretroviral therapy sites in Malawi: an application of Lot Quality Assurance Sampling

 

System without any review of data quality

LQAS Triaging

LQAS Triaging

Upper threshold = 95%

Upper threshold = 99%

Lower threshold = 85%

Lower threshold = 89%

n (sample size)

N/A

76

76

d (decision rule)

N/A

7

3

Number of sites above the upper threshold

N/A

16

9

Number classified as high data quality

N/A

16

9

Number of sites below the lower threshold

N/A

1

1

Number classified as low data quality

N/A

1

1

Differences between updated and non-updated data

  

Alive

+1.2%

+1.2%

+0.7%

Default

−5.6%

−5.8%

−2.8%

1st Line Rx

+0.4%

+0.3%

+0.1%

Substitute, AZT

−3.6%

−2.8%

−1.5%

Substitute, EFV

−9.7%

−9.7%

−3.1%

Time Required for Review

N/A

8 hours;5 minutes

13 hours;19 minutes

  1. Design and error rates in reporting under systems with a) no review process, b) LQAS classification system with pu = 0.95 and pl = 0.85, and c) LQAS classification system with pu = 0.99 and pl = 0.89. AZT = zidovudine. EFV = efavirenz.