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 Birth rate: number of live births/mid‐year population;

 Fertility rate: number of live births/number of women aged 15–44 years (Figure 1.3);

 Infant mortality rate: number of infant (<1 year) deaths/number of live births;

 Stillbirth rate: number of intrauterine deaths after 28 weeks/total births;

 Perinatal mortality rate: number of stillbirths + deaths in first week of life/total number of births.

Figure 1.3 Comparison of age‐specific fertility rates in women with treated epilepsy and general UK population of women in 1993

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