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Table 1 Formulae used to calculate mortality and stillbirth event rates

From: Trends in infant mortality and stillbirth rates in Scotland by socio-economic position, 2000–2018: a longitudinal ecological study

Mortality event

Calculation

Infant mortality rate

\( \frac{\mathrm{Deaths}\ \mathrm{aged}\ 0\;\mathrm{days}\ \mathrm{to}<1-\mathrm{year}}{\mathrm{Live}\ \mathrm{births}}\times 1000 \)

Neonatal mortality rate

\( \frac{\mathrm{Deaths}\ \mathrm{aged}\ 0-27\;\mathrm{days}}{\mathrm{Live}\ \mathrm{births}}\times 1000 \)

Post-neonatal mortality rate

\( \frac{\mathrm{Deaths}\ \mathrm{aged}\ 28\;\mathrm{days}\ \mathrm{to}<1-\mathrm{year}}{\mathrm{Live}\ \mathrm{births}}\times 1000 \)

Stillbirth rate

\( \frac{\mathrm{Stillbirths}\;}{\mathrm{Live}\ \mathrm{births}+\mathrm{Stillbirths}}\times 1000 \)

Extended perinatal mortality rate

\( \frac{\mathrm{Stillbirths}+\mathrm{Deathsaged}\kern0ex 0-27-\mathrm{days}}{\mathrm{Livebirths}+\mathrm{Stillbirths}}\times 1000 \)