Average start time for public high schools and percentage distribution of start times in public high schools, by selected school characteristics: 2011–12

          Percentage distribution of public high school start times  
Selected school characteristics Total number of public
high schools
  Average start time
for public high
schools (AM)1
  Before
7:30 AM
  7:30 AM to
7:59 AM
  8:00 AM to
8:29 AM
  8:30 AM to
8:59 AM
  9:00 AM or
later
 
All public schools  18,360   7:59   9.5   33.0   43.1   10.6   3.8  
                             
School classification                             
Traditional public  17,300   7:59   9.7   33.5   42.9   10.3   3.6  
Charter school  1,060   8:06   5.8 ! 23.8   47.5   14.8   8.2  
                             
Community type                             
City  4,060   8:05   9.1   25.8   41.6   16.9   6.7  
Suburban  4,340   7:51   18.4   41.9   28.3   7.7   3.7 !
Town  2,960   8:01   3.5   35.5   50.7   8.4   2.0 !
Rural  7,000   8:01   6.7   30.6   50.0   9.6   3.0 !
                             
Student enrollment                             
Less than 100 2,050   8:17     15.1   49.0   15.8   17.4  
100-199  1,820   8:08   2.0 ! 20.0   60.6   10.9   6.6 !
200-499  4,350   8:02   5.6   30.2   50.5   11.7   2.0 !
500-749  2,640   7:58   5.1   43.4   41.6   9.1   0.8 !
750-999  1,660   7:53   11.4   38.1   48.3   1.8 !  
1,000 or more  5,840   7:52   18.5   39.1   29.4   11.1   1.9 !
                             
Percent of K-12 students who
  were approved for free or
  reduced-price lunches
                           
0-34  6,560   7:54   11.1   41.8   36.6   8.6   1.9 !
35-49  3,480   8:00   11.0   30.7   45.4   9.8    
50-74  4,020   8:01   8.7   31.3   46.7   9.6   3.8 !
75 or more  3,020   8:06   8.1   22.0   47.1   15.9   6.9 !
   School did not participate
     in free or reduced-price
     lunch program
1,270   8:04   2.6 ! 24.8   50.2   13.5   8.9  
! 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 Schools with PM start times were not included in the average start time calculation. In 2011–12, 1 percent of public high schools reported PM start times.
NOTE: High schools include any schools where the lowest grade is any of grades 7–12 and the highest grade is any of grades 9–12. Detail may not sum to totals because of rounding and because some data not shown.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey (SASS), "Public School Data File," 2011–12.