225 Use of modern methods of family planning varies by district. Modern method use ranges from a low of 31% in Mangochi to a high of 68% in Chiradzulu. Modern contraceptive use increases with wealth; 53% of women from the poorest households use a modern method of family planning, compared to 61% of women from the wealthiest households. 226 The use of any method of family planning by married women has dramatically increased from 13% in 1992 to 59% in 2015-16. Similarly, modern method use has increased eightfold from 7% to 58% during the same time period. The most common media source of family planning messages is the radio. Four in ten women and 64% of men heard a family planning message on the radio in the few months before the survey. Women and men were much less likely to have seen a family planning message on television or in a newspaper/magazine. Overall, 42% of women and 17% of men were not exposed to family planning messages via any media source. 227 HIV prevalence data were obtained from blood samples voluntarily provided by women and men interviewed in the 2015-16 MDHS. Of the 8,497 women and 7,542 men age 1549 eligible for testing, 93% of women and 87% of men provided specimens for HIV testing. 228 Overall, 8.8% of Malawians age 15-49 are HIV positive. By district, HIV prevalence is lowest in Salima (3.0%) and highest in Mulanje (20.6%). HIV prevalence is higher among women (10.8%) than among men (6.4%). HIV prevalence is higher among women and men living in urban areas. Among women, HIV prevalence is lowest at age 15-19 (3.3%) and highest at age 40-44 (19.8%). Among men, HIV prevalence is lowest at age 15-19 (1.0%) and highest at age 45-49 (19.2%). 229 The graph below shows the prevalence by residence of men and women between ages 15 to 49 94