The health concerns of African-Americans are varied and critical. African-American men have the highest death rate of all racial and ethnic groups, male and female. The 10 leading causes of death for African-Americans are: heart disease; cancer; stroke; diabetes; unintentional injuries; homicide; nephritis, nephritic syndrome and nephrosis; chronic lower respiratory disease; HIV/AIDS and septicemia. There is also a high prevalence of hypertension, infant mortality and tuberculosis. Nearly one-third of African-Americans (ages 18 to 64) were not insured during 2001, compared to 20 percent of non-elderly white adults, which makes it difficult for some to obtain needed care. Blacks are also less likely than whites to have job-based insurance and are more likely to rely on public services. The 35 million African-Americans in the U.S. constitute 12 percent of the population. They are distributed throughout the United States, with the greatest concentrations in the Southeast and mid-Atlantic regions.