A CDC study found that, in the US, 1 in 71 men had been raped or suffered an attempt within their lifetime. The same study found that approximately 1 in 21 or 4.8% men in a survey had been made to penetrate someone else, usually an intimate partner or acquaintance. A NVAW Survey found that 0.1 percent of men surveyed had been raped in the previous 12 months, compared to 0.3 percent of women. Using these statistics it was estimated that, in the US, 92,748 men had been raped in the previous year. In another study by the School of Public Health at Boston University, 30 percent of gay and bisexual men reported having experienced at least one form of sexual assault during their lifetimes.