“Median income is the amount which divides the income distribution into two equal groups, half having incomes above the median, half having incomes below the median. The medians for households, families, and unrelated individuals are based on all households, families, and unrelated individuals, respectively. The medians for people are based on people 15 years old and over with income” (U.S. Census Bureau, 2004).
U.S. Census Bureau, Population Division, Fertility & Family Statistics Branch. (2004). Current Population Survey: Definitions and explanations. Retrieved from http://www.census.gov/population/www/cps/cpsdef.html