In this release, the Centers for Disease Control and Prevention's (CDC) National middle for Health Statistics (NCHS) updates estimates for 15 selected health measures based on data from the January-September 2012 National Health Interview Survey (NHIS) and presents estimates from 1997 through 2011 for comparison. The 15 Early Release measures are being published prior to final data editing and final weighting to supply access to the most recent information from NHIS. The estimates will be updated as each new quarter of NHIS data becomes available.
Source: cdc.gov