Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The relative index of inequality is calculated from a model with income (as an ordinal variable), with linear, quadratic and cubic polynomials for age, stratified by sex. We showed ages for which the sex/outcome combination has at least 5 cases in each income group. RII indicates relative index of inequality.
