as the number of males per 1000 females. [2] It is an index of male-female (im)balance in a population. One of the basic demographic characteristics of population is the sex composition. The sex composition of population is affected by the differentials in mortality conditions of males and females, sex selective migration, and sex ratio at birth. [1] The sex ratio in the Indian population has been falling consistently. From 972 women per 1000 men in 1901, the sex ratio fell to 940 women per 1000 men in 2011 (India Census 2011). This is a cause for concern as it is a telling indicator of the health and social status of women in society, which has a direct and immediate bearing on other key indicators such as child mortality. [3]