Regarding crude birth rate all are true except -

Crude birth rate is an indicator of fertility, but is not a better measure of fertility than general fertility rate. The crude birth rate is an unsatisfactory measure of fertility because the total population is not exposed to child bearing. Therefore it does not give a true idea of the fertility of a population. On the other hand, General fertility rate is a better measure of fertility than the crude birth rate because the denominator is restricted to the number of women in the child bearing age, rather than the whole population. Crude birth rate is not affected by changes in age composition as it is crude rate, i.e., does not take the sex and age composition of the population into account. Crude birth rate includes live births only and still births are excluded.