![]() ![]() population) can support more levels for health analyses than the relatively small nonmetropolitan population. metropolitan population (in 2010, about 85% of the U.S. The NCHS scheme has more metropolitan levels (four) than nonmetropolitan levels (two) because the large U.S. ![]() ![]() The levels of the NCHS scheme were chosen for their utility in studying health differences across the urban-rural continuum. 1990 census-based NCHS Urban-Rural Classification Scheme for Counties which is based on the OMB’s June 1993 delineation of MSAs (derived according to the 1990 OMB standards for defining these areas) and 1990 census data.2006 NCHS Urban-Rural Classification Scheme for Counties which is based on the OMB’s December 2005 delineation of MSAs and micropolitan statistical areas (MISA) (derived according to the 2000 OMB standards for defining these areas) and Vintage 2004 postcensal estimates of the resident U.S.2013 NCHS Urban-Rural Classification Scheme for Counties which is based on the Office of Management and Budget’s (OMB) February 2013 delineation of metropolitan statistical areas (MSA) and micropolitan statistical areas (derived according to the 2010 OMB standards for defining these areas) and Vintage 2012 postcensal estimates of the resident U.S.Three versions of the NCHS scheme are available: The most urban category consists of “central” counties of large metropolitan areas and the most rural category consists of nonmetropolitan “noncore” counties. NCHS has developed a six-level urban-rural classification scheme for U.S. National Center for Health Statistics (NCHS) data systems are often used to study the associations between urbanization level of residence and health and to monitor the health of urban and rural residents. ![]()
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