Table 1.

Formulae used to calculate mortality and stillbirth event rates

Mortality event	Calculation
Infant mortality rate	$\frac{\text{Deaths aged}0\text{days to}<1-\text{year}}{\text{Live births}}\times 1000$
Neonatal mortality rate	$\frac{\text{Deaths aged}0-27\text{days}}{\text{Live births}}\times 1000$
Post-neonatal mortality rate	$\frac{\text{Deaths aged}28\text{days to}<1-\text{year}}{\text{Live births}}\times 1000$
Stillbirth rate	$\frac{\text{Stillbirths}}{\text{Live births}+\text{Stillbirths}}\times 1000$
Extended perinatal mortality rate	$\frac{\mathrm{S}\mathrm{t}\mathrm{i}\mathrm{l}\mathrm{l}\mathrm{b}\mathrm{i}\mathrm{r}\mathrm{t}\mathrm{h}\mathrm{s}+\mathrm{D}\mathrm{e}\mathrm{a}\mathrm{t}\mathrm{h}\mathrm{s}\mathrm{a}\mathrm{g}\mathrm{e}\mathrm{d}0-27-\mathrm{d}\mathrm{a}\mathrm{y}\mathrm{s}}{\mathrm{L}\mathrm{i}\mathrm{v}\mathrm{e}\mathrm{b}\mathrm{i}\mathrm{r}\mathrm{t}\mathrm{h}\mathrm{s}+\mathrm{S}\mathrm{t}\mathrm{i}\mathrm{l}\mathrm{l}\mathrm{b}\mathrm{i}\mathrm{r}\mathrm{t}\mathrm{h}\mathrm{s}}\times 1000$