MORTWTSA is a variable with eight columns and no implied decimals.
MORTWTSA reports the sampling weight that adjusts for ineligible respondents in mortality analysis, based on linking NHIS respondents during survey years 1997 to 2009 to the National Death Index (NDI).
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 could lead to biased mortality analysis. To correct this bias, NCHS developed the eligibility-adjusted weight in MORTWTSA. MORTWTSA is a mortality weight designed for use with sample adult variables and is available for the NHIS years 1997-2009. (A similar variable, MORTWT, is appropriate for weighting variables from the NHIS person files in conjunction with mortality variables and is available for the NHIS years 1986-2009).
When analyzing NHIS variables from the sample adult files in conjunction with any of the mortality variables, users should employ MORTWTSA rather than the sample adult weight (SAMPWEIGHT). SAMPWEIGHT is based on the Final Annual Sample Adult Weights (for survey years 1997 forward) in the original NHIS public use files.
Only persons who were at least age 18 at the time of interview and who provided sufficient data (e.g., Social Security number, date of birth, and name) were eligible for linking to the NDI and eligible for inclusion in the linked public use mortality files (indicated by IPUMS NHIS code 1 in MORTELIG). Linked mortality data for children are not available for public use; researchers interested in access to such data, or in linked mortality data with additional detail, should review the technical documentation at NHIS Linked Mortality Files.
For additional information, see the NHIS Analytic Guidelines (2010) at NHIS Linked Mortality Files. Further information is also available in the variable description for MORTELIG and in the IHIS User Note on the use of sampling weights.
Related VariablesFor a list of the other mortality variables included in the IHIS, please refer to the MORTSTAT variable description.
- 1997-2009: Sample adults age 18+ eligible for mortality follow-up.
- 1997-2009 : MORTWT