Figure 4.
Overall stratification by SDG variables. Legend to Figure 4: Ex = excluded; H = homogeneous; IS = incomplete/inadequate stratification; na = not available; NP = not present; NS = not stratified; S = stratified.
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.