More than 26 million refugees, asylum-seekers and internally displaced persons are registered worldwide and millions more are unregistered. 50% are girls and women. Gender-based violence tends to increase in refugee situations, where reproductive health services are often lacking. For example, a 1994 study of Rwandan refugees in Tanzanian camps found that 60% of the women had a reproductive tract infection and more than 20% of births at a Burundi refugee camp in Tanzania in 1998 were below average weight, and infant deaths rose sharply from prewar levels. Of Rwandan women who reported being raped, 17% were HIV-positive.