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Table 4 Indicators for stability used for the evaluation of the influenza sentinel surveillance system in Zambia, 2011-2017a

From: An evaluation of the Zambia influenza sentinel surveillance system, 2011–2017

IndicatorCalculation/data inputsData sourceIndicator valueScore
Stability
• Frequency of lack of data collection formsNumber of surveillance sites within each reported category [never (0), once per year (1), 2–3 times per year (2–3), ≥4 times per year(≥4)] / Number of surveillance sitesQuestionnaire for surveillance staff at sentinel sites0: 83.3%3
1: 16.7%
2–3: 0.0%
≥4: 0.0%
• Frequency of lack of sampling materialNumber of surveillance sites within each reported category [never (0), once per year (1), 2–3 times per year (2–3), ≥4 times per year(≥4)] / Number of surveillance sitesQuestionnaire for surveillance staff at sentinel sites0: 83.3%3
1: 16.7%
2–3: 0.0%
≥4: 0.0%
• Frequency at which a power failure, including the generator, occurred at the surveillance sitesNumber of surveillance sites within each reported category [never (N), seldom (S), often (O), regularly (R)] / Number of surveillance sitesQuestionnaire for surveillance staff at sentinel sitesN: 16.7%2
S: 50.0%
O: 33.3%
R: 0.0%
• Proportion of sentinel sites with at least one member of staff trained on sentinel surveillance proceduresNumber of sentinel sites with at least one trained member of staff / Number of surveillance sitesQuestionnaire for surveillance staff at sentinel sites100.0%3
• Proportion of sentinel surveillance staff ever trained on sentinel surveillance proceduresNumber of surveillance staff ever trained / Number of surveillance staffQuestionnaire for surveillance staff at sentinel sites90.7%3
• Proportion of sentinel surveillance staff trained on sentinel surveillance procedures during the last one yearNumber of surveillance staff during the last one year / Number of surveillance staffQuestionnaire for surveillance staff at sentinel sites69.7%2
• Availability and use of standard operating procedures (SOPs) by surveillance staffNumber of surveillance staff with access and use of SOPs / Number of surveillance staffQuestionnaire for surveillance staff at sentinel sites97.7%3
• Proportion of surveillance sites providing samples weekly after 3 months from inceptionNumber of surveillance sites providing samples weekly/ Number of surveillance sitesISS database100.0%3
• Proportion of weekly surveillance reports sent to MoHNumber of surveillance reports sent to MoH / Number of reporting weeksSurveillance reports71.4%2
  1. Abbreviations: ISS influenza sentinel surveillance; MoH Ministry of Health
  2. aEach quantitative indicator was evaluated as the proportion (expressed as percentage) of the outcome of interest over the total (indicator value). A scale from 1 to 3 was used to provide a score for each quantitative indicator as follows: < 60% (from the above calculation) scored 1 (weak performance); 60–79% scored 2 (moderate performance); ≥80% scored 3 (good performance)