Population dynamics on the developed and underdeveloped countries

Abstract

The main factors that contributed to the population dynamic in developed and underdeveloped countries and the policies of these countries used, even the aplication of demography in Public Health, are analysed. The greater population growth in under developed countries is observed. Thus, by the year 2000, the region called "third world" will present the higger population contingent, for the underdeveloped countries will contribute with 79% from the total world population. The first demographic transition began in 17th century in Europe with the process of industrial revolution while in underdeveloped countries this occurred in the beginning of 1940 with a deep difference since the decline of mortality rate presented was not followed either by a significative decline of birth rate, or even by the modernization of their economics. Among the main factors that influenced mortality and fertility factors are the influence of economic and social development, and also the progress in medical and public health fields. 66% of underdeveloped countries population is under birth rate control and in a decrescent order the most used contraceptive has been the intrauterine device (IUD), sterilization and pills. India, in four years (1964-68), sterilized 5,200.000 inhabitants with an average age of 32 years old. The health planning, migration, epidemiology and maternal and child health are mentioned among the main applications of demography on Public Health.