One industry study matched health savings account holders to the neighborhood income ("neighborhood" was defined as their census tract from the 2000 Census) and found that 3% of account holders lived in "low-income" neighborhoods (median incomes below $25,000 in 1999 dollars), 46% lived in lower-middle-income neighborhoods (median incomes between $25,000 and $50,000), 34% lived in middle-income neighborhoods (median incomes between $50,000 and $75,000), 12% lived in upper-income neighborhoods (median incomes between $75,000 and $100,000) and 5% lived in higher income neighborhoods (median incomes above $100,000).