A quarter of the world's women were child brides
Such practices were found to be most prevalent in South Asia, where 44 percent of women surveyed had been a child bride - 17 percent were under the age of 15 at the time.
At the current rate, girlsnotbrides.org estimates that there will be an additional 1.2 billion girls married globally by 2050.
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This graphic shows the share of women who were married before the age of 18, by region.