Sex-selective abortion is the practice of terminating a pregnancy based upon the predicted sex of the infant. The selective abortion of female fetuses is most common in areas where cultural norms value male children over female children, especially in parts of People's Republic of China, India, Pakistan, the Caucasus, and Southeast Europe.Sex-selective abortion affects the human sex ratio—the relative number of males to females in a given age group. Studies and reports focusing on sex-selective abortion are predominantly statistical; they assume that birth sex ratio—the overall ratio of boys and girls at birth for a regional population, is an indicator of sex-selective abortion. This assumption has been questioned by some scholars.Scholars who support the assumption suggest that the expected birth sex ratio range is 103 to 107 males to females at birth. Countries considered to have significant practices of sex-selective abortion are those with birth sex ratios of 108 and above (selective abortion of females), and 102 and below (selective abortion of males).