The report said nearly one in six children around the world — some 415 million children — were living in a conflict zone in 2018, more than double the figure recorded in 1995.
Incidents of “grave violations” against them had risen by 170 percent since 2010, the “Stop the War on Children” study found.
African children were the worst affected, with 170 million living in war zones, although a higher proportion were hit in the Middle East, where almost one in three were surrounded by conflict.
The report also found record numbers of children being subjected to grave violations: killing and maiming; recruitment by armed forces; abduction; attacks on schools or hospitals; denial of humanitarian access; and rape and other forms of sexual violence.
For individual countries, the situation was worst in Afghanistan followed by the Central African Republic, the Democratic Republic of the Congo, Iraq and Mali.
Different threats faced by boys and girls were analyzed for the first time.
“Girls are at far higher risk of sexual and other forms of gender-based violence, including a child, early and forced marriage,” the study found.
“Boys are much more likely to be exposed to killing and maiming, abductions and recruitment,” it added.