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Percentage of public schools operating on any type of 12-month cycle and percentage of schools with all students attending on the same year-round cycle, by selected school characteristics: 2007–08, 2011–12, 2017–18

  Percent of schools operating on any type of 12-month cycle   Percent of schools with all students attending on the same year round cycle  
Selected school characteristics 2007-08   2011-12   2017-181   2007-08   2011-12   2017-181  
   All public schools 5.5   4.1   3.0   4.4   3.2   2.5  
                         
School classification                        
Traditional public 5.3   3.8   2.8   4.3   3.0   2.2  
Charter school   9.0   6.3     6.9   5.7  
                         
Community type                        
City 9.5   5.9   3.9   7.3   5.1   3.1  
Suburban 5.6   4.2   3.0   4.2   3.2   2.4  
Town 3.5   2.4   2.6   2.7 ! 1.8   1.8 !
Rural 3.4   3.3   2.4   3.2   2.4   2.4  
                         
Student Level                        
Primary 5.8   3.7   1.9   4.5   3.2   1.7  
Middle 2.3   2.5   1.4   2.2   2.2   1.2  
High 5.3   4.5   5.4   4.1   2.9   4.0  
Combined 9.8   8.5   7.4   8.6   6.3   5.7  
                         
Student enrollment                        
Less than 100 9.1   8.5   12.8   7.6 ! 5.8   8.5  
100–199 4.3 ! 4.9   5.0   3.6 ! 3.4   4.3  
200–499 4.8   3.7   2.4   4.4   3.1   2.3  
500–749 4.6   2.7   1.6   3.5   2.5   1.5  
750–999 6.8   4.4 ! 1.8   3.3 ! 3.4 ! 1.3 !
1,000 or more 7.1   4.6   2.3   5.0   3.4   1.6  
                         
Percent of K–12 students who were approved
for free or reduced‑price lunches
                       
0–34 3.8   2.2   1.7   2.9   1.8   1.4  
35–49 3.1   2.2 ! 1.8   2.9   1.9 ! 1.7  
50–74 4.3   2.7   2.3   3.5   2.3   2.0  
75 or more 10.1   7.2   3.7   8.1   6.1   3.1  
School did not participate in free or
reduced-price lunch program
13.2 ! 15.7   12.5   9.3 ! 8.8   8.8  
! Interpret data with caution. The coefficient of variation (CV) for this estimate is between 30 percent and 50 percent (i.e., the standard error is at least 30 percent and less than 50 percent of the estimate).
‡ Reporting standards not met. The coefficient of variation (CV) for this estimate is 50 percent or greater (i.e., the standard error is 50 percent or more of the estimate).
1 Bureau of Indian Education (BIE) funded schools were not separated from public schools during sampling for the 2017– 18 NTPS. As a result, some BIE schools may be included in the 2017–18 estimates.
NOTE: Estimates for 2007–08 may differ from previously published SASS tables because the year-round school information in this table was taken from an unedited version of the data files. Caution should be used when comparing across data collections, as there were changes to the methodology of NTPS and SASS.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), unedited and restricted-use versions of the "Public School Data File," 2007–08, "Public School Data File," 2011–12, and National Teacher and Principal Survey (NTPS) "Public School Data File," 2017–18."