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Total number of teachers and mean and median years of teaching experience for public and BIE school teachers, by teaching level and selected main assignment categories: 2007–08

School type and selected
main assignment 		Elementary-level Secondary-level
Total number of teachers   Mean years teaching experience   Median years teaching experience   Total number of teachers   Mean years teaching experience   Median years teaching experience  
All public school teachers  1,724,900   13.8   10.9   1,679,600   13.4   9.9  
                         
Elementary/early childhood education  1,100,300   13.5   10.5   †   †   †  
Special education  229,500   13.2   9.9   165,300   13.9   10.1  
English as a second language  24,200   12.5   10.4   20,700   11.8   9.4  
English and language arts  103,700   16.5   14.1   306,300   13.1   9.1  
Mathematics and computer science  34,400   17.2   12.8   264,200   12.9   9.4  
                         
Science  15,100   14.3   12.0   195,400   13.0   10.2  
Social science  13,400   12.5   9.4   209,400   12.7   9.4  
Foreign language  6,600   10.7   9.4   77,700   13.4   9.3  
Art and music  102,900   14.4   12.5   121,300   15.1   12.5  
Career/technical education  7,600   14.5   9.6   164,300   14.3   11.3  
All others1  87,000   14.9   12.9   155,100   14.2   11.2  
                         
All BIE school teachers  2,700   14.4   11.9   1,700   14.1   9.6  
† Not applicable.
1 All others includes health education, physical education, driver education, library/information science, military science/ROTC, philosophy, religious studies, and other categories not specified.
NOTE: Elementary-level teachers either instruct any of grades prekindergarten through 5th grade and have a main teaching assignment of early childhood/prekindergarten, elementary education, special education (in self-contained classrooms), or elementary enrichment; or teach most or all of their classes in any of grades K-6. Secondary-level teachers instruct any of grades 7-12 but usually no grade lower than 5th. They also teach more of grades 7-12 than lower grade levels. Teachers of only ungraded classes are considered elementary-level teachers if their main assignment is is early childhood/prekindergarten or elementary, or they teach either special education in a self-contained classroom or an elementary enrichment class. All other teachers with ungraded classes are classified as secondary level. BIE school refers to schools funded by the Bureau of Indian Education (BIE) that are operated by the BIE, a tribe, or a private contractor and not by a regular school district. Detail may not sum to totals because of rounding.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public School Teacher and BIE School Teacher Data Files," 2007-08.

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