Reduce firearm-related deaths — IVP‑13 Data Methodology and Measurement

FOR SINGLE DATA YEARS: Death rates are calculated based on the resident population of the United States for the data year involved. Population counts enumerated as of April 1st are used for census years (e.g., 2010). Population estimates as of July 1st are used for all other years. Postcensal population estimates are used in rate calculations for years after a census and match the data year vintage (e.g., July 1, 2011, resident population estimates from Vintage 2011 are used as the denominator for 2011 rates). Intercensal population estimates are used in rate calculations for the years between censuses (e.g., 1991–1999, 2001–2009). Bridged-race categories are used for race-specific population estimates for 1991 and later. FOR MULTIPLE DATA YEARS: Death rates are calculated based on the sum of the resident populations for each of the data years involved (e.g., the denominator of a rate for 2008–2010 combined is the sum of the population estimates for 2008, 2009, and 2010). Population counts enumerated as of April 1st are used for census years (e.g., 2010). Population estimates as of July 1st are used for all other years. Postcensal population estimates are used in rate calculations for post-census years and match the data year vintage (e.g., July 1, 2011, resident population estimates from Vintage 2011 are used as the denominator for 2011 rates). Intercensal population estimates are used in rate calculations for the years between censuses (e.g., 1991–1999, 2001–2009). Bridged-race categories are used for race-specific population estimates for 1991 and later.