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.
Age distribution of the study sample compared with the total population
Census for the population of Saudi Arabia in 2013 was retrieved from the Saudi Arabia Central Department of Statistics and Information (detailed numbers in the appendix).
