... high death rates to low death rates and Fertility transition as the pattern of change in birthrates in a human society from high rates to low". (Wright, 2005) Demographic transition can be defined as the change of a population from high birth and death rates to low birth and death rates. The demographic transition generally occurs in four stages. In the initial stage, both birth and death rates are high, causing only slow and steady population growth. In the next stage, death rates begin to decline and birth rates remain high, resulting in faster population growth. In stage three, the birth rate begins to decline, and in the final stage, birth rates balance death rates. Population growth stabilizes in the final stage. Epidemiological transition relates Demographic transition. There is a continuation of slow and often fluctuating mortality declines which are increasingly concentrated at the later stages of life; Stability and even ...

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