Before revision: If the pyramid has a broad base, this indicates that a relatively high proportion of the population lies in the youngest age band, such as ages 0– 14, which suggests that the fertility rate of the country is high and above replacement fertility level.
After revision: If the pyramid has a broad base, this indicates that a relatively high proportion of the population lies in the youngest age band, such as ages 0– 15 which suggests that the birth rate of the country is high and above replacement fertility level.