Codes and Frequencies
For persons age 18+ included in the NHIS during survey years 1986 to 2014 who provided sufficient data for linking (MORTELIG) and whose final vital status was judged deceased (MORTSTAT), MORTDODQ reports the quarter of death. This information was determined by NCHS based on probabilistic matches of survey participants' NHIS records to National Death Index (NDI) records. The related variable MORTDODY reports the year of death.
For further information on the NDI and the creation of the mortality variables, see the variable description for MORTELIG and the NHIS Analytic Guidelines (2010) at NHIS Linked Mortality Files
Because adult survey participants who provided insufficient data for linking may differ from those who provided enough data for linking, ignoring the ineligible adult respondents (IPUMS NHIS code 3 in MORTELIG) could lead to biased mortality analysis. To correct this bias, NCHS developed eligibility-adjusted weights: MORTWT, available for 1986-2014, for use with variables from the NHIS person files, and MORTWTSA, available for 1997-2014, for use with variables from the sample adult files. When analyzing NHIS variables from the person files in conjunction with MORTDODQ, users should employ MORTWT (rather than the standard person weight, PERWEIGHT). When analyzing NHIS variables from the sample adult files in conjunction with MORTDODQ, users should use MORTWTSA (rather than the standard sample weight, SAMPWEIGHT).
For a list of the other mortality variables included in the IPUMS NHIS, please refer to the MORTSTAT variable description.
- 1986-2014: All persons age 18+ eligible for mortality follow-up and assumed dead.
- 1986-2014 : MORTWT