One first child out of every five was conceived before marriage, according a study by Lee Byoung-ho at the Gyeonggi Research Institute.
Lee found that 14.5 percent of first children from married couples from 2001 to 2015 were conceived before marriage.
Lee analyzed demographic data from Statistics Korea and checked the time a couple had been married by the time of the first child's birth. Premature births were excluded.
Interestingly, these "shotgun marriages" are on the rise. In 2001, brides were pregnant in only 7.5 percent of marriages, but that rose 2.4 times to 17.8 percent by 2015.
Couples between 20 and 24 made up the highest proportion at 30.5 percent, followed by those in their late teens (23.4 percent) and late 20s (15.4 percent).
The younger the married couple, the higher the chances of conceiving their first child before marriage.
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