<prompt> Child survival index is the percentage of children surviving till the age of -1 year3 years5 years15 years  <response>: parks textbook of preventive and social medicine 23rd edition. child survival index:the basic measurement of infant and child survival is the under 5 moality.A child survival rate per 1000 bih can be simply calculated by subtracting the under 5 moality rate from 1000 dividing this figures by 10 shows the percentage of those who survive to the age of 5 year. 