In the less developed world, it averaged 60 per cent but with wide disparities among its major areas: prevalence ranged from only 25 per cent in Africa to over 65 per cent in Asia and Latin America and the Caribbean.
在较不发达区域，平均达60%，不过各主要地区之间差别很大：非洲的普及率仅为25%，而亚洲和拉丁美洲及加勒比达65%以上。