The report, Global and regional estimates of violence against women: Prevalence and health effects of intimate partner violence and non-partner sexual violence, represents the first systematic study of global data on the prevalence of violence against women – both by partners and non-partners.

Some 35 per cent of all women will experience either intimate partner or non-partner violence, according to the report, which was released today by the UN World Health Organization (WHO), in partnership with the London School of Hygiene & Tropical Medicine and the South African Medical Research Council.

It also finds that intimate partner violence is the most common type of violence against women, affecting 30 per cent of women worldwide, according to a WHO news release.

“These findings send a powerful message that violence against women is a global health problem of epidemic proportions,” said WHO Director-General Margaret Chan. “We also see that the world’s health systems can and must do more for women who experience violence.”

The report details the impact of violence on the physical and mental health of women and girls, ranging from broken bones to pregnancy-related complications, mental problems and impaired social functioning.

Among its key findings on partner violence was that globally, 38 per cent of all women who were murdered were killed by their intimate partners. Also, women who have experienced partner violence are almost twice as likely to experience depression or abuse alcohol.

“This new data shows that violence against women is extremely common. We urgently need to invest in prevention to address the underlying causes of this global women’s health problem.” said Professor Charlotte Watts, from the London School of Hygiene & Tropical Medicine.

Fear of stigma prevents many women from reporting non-partner sexual violence, the survey finds. Other barriers to data collection include the fact that fewer countries collect this data than information about intimate partner violence, and that many surveys of this type of violence employ less sophisticated measurement approaches than those used in monitoring intimate partner violence.

“The review brings to light the lack of data on sexual violence by perpetrators other than partners, including in conflict-affected settings,” said Naeemah Abrahams from the South African Medical Research Council. “We need more countries to measure sexual violence and to use the best survey instruments available.”

The study highlights the need for all sectors to work together to eliminate tolerance for violence against women and to better support women who experience it. New WHO guidelines, launched with the report, aim to help countries improve their health sector’s capacity to respond to the problem.

“The report findings show that violence greatly increases women’s vulnerability to a range of short- and long-term health problems; it highlights the need for the health sector to take violence against women more seriously,” said Claudia Garcia-Moreno of WHO. “In many cases this is because health workers simply do not know how to respond.”

The guidelines stress the importance of training all levels of health workers to recognize when women may be at risk of partner violence and to know how to provide an appropriate response.

They also point out that some health-care settings, such as antenatal services and HIV testing, may provide opportunities to support survivors of violence, provided certain minimum requirements are met.

WHO will begin to work with countries in South-east Asia to implement the new recommendations at the end of June.