This document discusses several topics related to marriage norms and practices: - It defines child marriage and notes that while it affects both boys and girls, the majority impacted are girls. For both sexes, early marriage cuts off educational and growth opportunities and can have physical and psychological consequences. - It lists several factors that drive child marriage practices, including poverty, cultural traditions, religious pressures, and gender inequality. Several countries and regions still have high rates of child marriage. - The sex ratio is defined as the ratio of males to females in a population, typically expressed as males per 100 females. Globally the ratio at birth is around 106 males to 100 females, though this varies by region and country. - The term "