Statistics and Data Analysis: Definitions and Notes

Cases:  Estimated number of mentally ill meeting the cell criteria.
Household (HH): A household includes all of the people who occupy a housing unit.*1,
Institutionalized population (Inst): The institutionalized population includes people under formally authorized, supervised care or custody in institutions at the time of enumeration. 
Group quarters population (Group): the non-institutionalized population, which includes all people who live in group quarters other than institutions (such as college dormitories, military quarters, and group homes).
Percent: Estimated number of mentally ill as a percent of the corresponding population cell.
Pop: A US Census based estimate of the number of people meeting the specified combination of conditions: county, type of residence, age, gender ethnicity, marital status, education, and poverty level.
Series P5 Estimates:  This is a reference to a scheme for measuring Poverty in 5 levels, adopted at the University of Texas, Medical Branch (UTMB).  The lowest level includes all people living between no income and 100% of the federally defined poverty level.  Levels two and three include people living between 100-199% and 200-299% of poverty, respectively.  Level four includes those people living at or above 300% of the poverty level.  Finally, the fifth level includes all those living at an undefined level of poverty.  The undefined are primarily institutionalized and group quartered individuals.*2

For more detailed information see:
*1 www.census.gov/Press-Release/www/2002/demoprofiles.html.
*2 Personal Communications: Charles Holzer, PhD., UTMB, Galveston, TX.