Official websites use .gov
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.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.
Letters indicate results of Dunn’s multiple group comparison tests. Symbols overlaying the bar graphs indicate the data points for all sites in each region. Six sites each were surveyed in Al Lith (triangles) and Yanbu (circles) and ten sites in Thuwal (squares).
