“…Where adolescent participants missed education during menstruation it was normally due to pain [8,32,34,49,56,58,61,64,65,71,80,87,99,103,122,127,129]. Many participants did not engage socially during menstruation [34,36,40,41,48,58,61,71,72,80,81,87,92,94,95,99,112,119,122,129,135]; some were not allowed to (normally by mothers) [36,38,41,45,65,71,72,[92][93][94]119]. Those who reached menarche in the early-mid 20 th C were often instructed not to inte...…”