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¹ The item response rate for the variable on years of experience of principals working as teachers is below 85 percent. Missing data have not been explicitly accounted for.
² The item response rate for the variable on years of experience of principals working as principals is below 85 percent. Missing data have not been explicitly accounted for.
³ The item response rate for the variable on principal age is below 85 percent. Missing data have not been explicitly accounted for.

NOTE: Values for the variable on years of experience of principals working as teachers range from 0 to 49, values for the variable on years of experience of principals working as principals range from 0 to 50, and values for the variable on principal age range from 20 to 80. Some apparent differences between estimates may not be statistically significant. Education systems are ordered by years of experience of principals working as teachers, from low to high. This graph displays the average years of experience of lower secondary education (grades 7-9 in the United States) principals working as teachers, working as principals, and their average age. For example, the graph indicates that in the United States, the average principal has approximately 13 years of experience working as a teacher, seven years working as a principal, and is 48 years old.

SOURCE: Organization for Economic Cooperation and Development (OECD), Teaching and Learning International Survey (TALIS), 2013.