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Table 3 Examination of outliers and internal consistency between indicators (2014–2017)

From: A data quality assessment of the first four years of malaria reporting in the Senegal DHIS2, 2014–2017

  2014 2015 2016 2017
Percentage of values that are moderate outliers a 5.6 5.6 5.2 4.4
Percentage of values that are extreme outliers a 2.2 2.5 2.4 2.1
Number of districts reporting > 5% moderate outlier monthly values 51 55 47 28
Number of districts reporting > 5% extreme outlier monthly values 1 2 4 1
Percentage of events where confirmed cases > tested cases 0.06 0.03 0.01 0.01
  1. a Numerator = sum of occurrences of outliers [± 2(3) SD relative to the mean of reported values] over the 12 months for the 3 indicators; Denominator = (number of health facilities multiplied by 12 months)