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Table 2 Indictors and formula to calculate vaccine coverage and wastage rates

From: A retrospective review of vaccine wastage and associated risk factors in the Littoral region of Cameroon during 2016–2017

Indicator

Formulae

Vaccination coverage rate

\(\frac{Number\ of\ children\ vaccinated}{Number\ of\ eligible\ children}\times 100\)

Number of doses used

Doses received + Doses in stock − usable doses remaining

Number of doses wasted

Doses used − Children vaccinated

Vaccine usage rate

\(\frac{Children\ vaccinated}{Doses\ used}\times 100\)

Vaccine Wastage Rate (VWR)

\(100- Vaccine\ usage\ rate=\frac{Doses\ wasted}{Doses\ used}\times 100\)

Vaccine Wastage Factor (VWF)

\(\frac{100}{100- Vaccine\ wastage\ rate}=\frac{100}{Vaccine\ usage\ rate}\)