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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.