Researchers at the University of Maryland have recorded attacks on education between 1970 and 2013.
The Global Terrorism Database shows a sharp increase in attacks since 2004.
Pakistan had the highest number, but the figures do not include last month's massacre of school pupils in Peshawar.
The report, Terrorist Attacks on Educational Institutions, examines the long-term incidence of deliberate aggression against places of learning.
But researchers say that fatal assaults on schools such as in Peshawar in north-west Pakistan, where more than 140 students and staff were killed, mark a deadly and unusual departure from the typical pattern."
Read article by Sean Coughlan from BBC News.