A survey by the German development agency GTZ from June, 2006 of more than 5,000 Cameroonian girls and women between the ages of 10 and 82, estimated that nearly one in four had undergone breast ironing, corresponding to four million girls in Cameroon alone. Incidence is as high as 53% in the Cameroon\'s southeastern region of Littoral. Compared with Cameroon\'s Christian and animist south, breast ironing is less common in the Muslim north, where only 10 percent of women are affected.