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Table 07.  Number and percentage of public schools reporting disruptions at school from unplanned fire alarms, death threats, bomb threats, or chemical, biological, or radiological threats, the number of incidents reported, and the rate of disruptions per 1,000 students, by selected school characteristics: School year School year 2015–16
      Total disruptions   Disruptions from unplanned fire alarms   Disruptions from death threats, bomb threats, or chemical, biological, or radiological threats  
School characteristic Total number of schools   Number of schools   Percent of schools   Number of incidents   Rate per 1,000 students   Number of schools   Percent of schools   Number of incidents   Rate per 1,000 students   Number of schools   Percent of schools   Number of incidents   Rate per 1,000 students  
All public schools  83,600   25,500   30.5   50,900   1.0   21,700   25.9   40,300   0.8   7,100   8.4   10,600   0.2  
                                                     
Level1                                                    
Primary  49,100   13,500   27.4   24,800   1.0   11,500   23.4   20,000   0.8   3,500   7.0   4,800   0.2  
Middle 15,600   5,000   32.1   10,000   1.0   4,100   26.4   7,500   0.8   1,400   9.2   2,500   0.3  
High school 12,800   5,600   43.5   13,100   1.0   4,800   37.5   10,200   0.8   1,900   14.9   2,900   0.2  
Combined 6,200   1,500   23.8   2,900   1.1   1,300   21.1   2,700 ! 1.0 ! 300 ! 4.4 ! 300 ! 0.1 !
                                                     
Enrollment size                                                     
Less than 300  18,200   3,200   17.7   6,500   1.6   3,100   16.9   6,200   1.5   300 ! 1.5 ! 300 ! 0.1 !
300–499  25,000   6,500   26.1   12,300   1.2   5,600   22.5   10,000   1.0   1,600   6.3   2,400   0.2  
500–999  31,700   11,100   35.1   20,300   0.9   9,000   28.5   15,100   0.7   3,600   11.4   5,200   0.2  
1,000 or more  8,700   4,600   53.0   11,700   0.9   4,000   45.5   9,000   0.7   1,600   18.3   2,600   0.2  
                                                     
Locale                                                    
City  22,800   8,200   36.2   18,800   1.3   7,100   31.3   14,800   1.0   2,500   11.1   4,000   0.3  
Suburb 27,400   8,600   31.4   16,000   0.8   7,000   25.7   12,200   0.6   2,600   9.4   3,800   0.2  
Town  11,000   3,400   30.6   6,600   1.2   2,800   25.1   5,300   0.9   1,000   9.4   1,300   0.2  
Rural  22,500   5,300   23.5   9,400   1.0   4,800   21.2   8,100   0.9   900   4.1   1,400   0.2  
                                                     
Crime level where
students live2
                                                   
High  7,400   2,800   38.0   6,800   1.4   2,400   32.8   5,400   1.1   1,000   13.2   1,300   0.3  
Moderate  17,500   6,700   38.2   13,900   1.3   5,300   30.4   10,500   1.0   2,100   11.9   3,500   0.3  
Low  48,400   12,800   26.5   23,100   0.8   11,100   23.0   18,500   0.7   3,400   6.9   4,700   0.2  
Mixed  10,400   3,200   30.9   7,100   1.0   2,800   27.1   6,000   0.9   700   6.3   1,100 ! 0.2 !
                                                     
Percent combined enrollment of
Black, Hispanic, Asian, Pacific
Islander, and American Indian/
Alaska Native students, and
students of Two or more races
                                                   
Less than 5 percent  5,300   1,100   21.4   2,200   1.1   1,000   19.4   1,900 ! 1.0   200 ! 3.8 ! 300 ! 0.2 !
5 to less than 20 percent  21,300   4,700   22.0   8,300   0.8   4,000   18.9   6,600   0.6   1,200   5.4   1,700   0.2  
20 to less than 50 percent  21,900   7,000   31.9   11,800   0.9   5,900   26.9   9,400   0.7   2,000   9.0   2,400   0.2  
50 percent or more  35,100   12,700   36.2   28,600   1.2   10,700   30.6   22,400   1.0   3,700   10.7   6,200   0.3  
                                                     
Percent of students eligible for
free or reduced-price lunch
                                                   
0–25 percent  13,900   3,000   21.4   5,100   0.5   2,500   17.7   4,100   0.4   800   5.6   1,000   0.1  
26–50 percent  23,400   6,600   28.2   12,700   1.0   5,800   24.6   9,900   0.7   1,900   7.9   2,800   0.2  
50–75 percent  23,000   7,400   32.0   13,600   1.0   6,300   27.2   10,700   0.8   1,900   8.3   2,900   0.2  
More than 75 percent  23,300   8,500   36.7   19,400   1.5   7,200   30.9   15,700   1.2   2,500   10.9   3,800   0.3  
                                                     
Percent of students below 15th
percentile on standardized tests
                                                   
0–5 percent  21,700   5,000   23.3   9,500   0.8   4,200   19.2   7,900   0.6   1,400   6.3   1,600   0.1  
6–15 percent  32,900   10,400   31.5   19,300   1.0   8,800   26.9   15,300   0.8   2,700   8.3   4,000   0.2  
More than 15 percent  29,000   10,100   34.8   22,100   1.3   8,700   29.9   17,100   1.0   3,000   10.2   4,900   0.3  
                                                     
Percent of students likely
to attend college
                                                   
0–35 percent  16,100   4,600   28.6   10,300   1.2   4,000   25.1   8,300   1.0   1,300   8.1   2,000   0.2 !
36–60 percent  20,900   7,700   36.8   15,200   1.2   6,600   31.5   12,200   1.0   2,000   9.6   3,000   0.2  
More than 60 percent  46,600   13,200   28.3   25,400   0.9   11,100   23.7   19,800   0.7   3,700   8.0   5,600   0.2  
                                                     
Percent of students who consider
academic achievement very important
                                                   
0–25 percent  4,500   1,500   32.4   3,500 ! 1.7 ! 1,200   27.5   3,000 ! 1.4 ! 400 ! 8.4 ! 500   0.2 !
26–50 percent  13,800   4,700   34.0   9,800   1.3   4,000   29.2   7,600   1.0   1,300   9.1   2,200   0.3  
51–75 percent  24,300   8,000   33.0   15,300   1.1   6,800   28.0   12,000   0.8   2,200   9.0   3,300   0.2  
More than 75 percent  41,100   11,300   27.6   22,300   0.9   9,600   23.5   17,700   0.7   3,200   7.9   4,600   0.2  
                                                     
Percent male enrollment                                                     
0–44 percent  6,400   1,600   25.4   3,300   1.2   1,400   21.6   2,600   0.9 ! 500 ! 7.6 ! 700 ! 0.2 !
45–55 percent  69,200   21,600   31.3   43,100   1.0   18,400   26.7   34,000   0.8   6,000   8.7   9,100   0.2  
More than 55 percent  8,000   2,200   27.7   4,500   1.1   1,900   23.3   3,700   0.9   600   7.3 ! 800 ! 0.2 !
                                                     
Student-to-FTE ratio3                                                    
Less than 12 students  11,400   2,700   23.4   4,900   1.4   2,100   18.8   3,900   1.1   700   6.1   1,000 ! 0.3 !
12–16 students  29,100   8,600   29.5   16,400   1.1   7,400   25.5   13,400   0.9   2,100   7.1   3,000   0.2  
More than 16 students  43,100   14,200   33.0   29,500   1.0   12,100   28.1   23,100   0.8   4,300   10.0   6,500   0.2  
                                                     
Number of classroom
changes4
                                                   
0–3 changes  20,000   5,400   26.8   9,900   1.0   4,700   23.5   8,300   0.8   1,300   6.5   1,700   0.2  
4–6 changes  37,000   11,400   30.9   24,100   1.0   9,600   25.9   18,700   0.8   3,200   8.7   5,300   0.2  
More than 6 changes  26,600   8,700   32.7   16,900   1.0   7,400   27.8   13,300   0.8   2,500   9.5   3,600   0.2  
                                                     
Regular use of
security staff5
                                                   
Regular use  47,200   16,600   35.2   35,500   1.1   14,100   29.8   27,600   0.8   5,000   10.6   8,000   0.2  
No regular use  36,300   8,900   24.4   15,300   0.9   7,600   21.0   12,700   0.8   2,000   5.6   2,600   0.2  
                                                     
Number of serious
discipline problems6
                                                   
No problems  66,500   18,900   28.4   36,300   1.0   16,300   24.4   29,300   0.8   4,800   7.1   7,000   0.2  
1 problem  10,000   3,800   37.5   8,000   1.2   3,000   29.9   6,100   0.9   1,400   13.6   1,800   0.3  
2 problems  4,500   1,700   37.4   4,100   1.3   1,500   33.3   3,100   1.0   500 ! 11.3 ! 1,000 ! 0.3 !
3 or more problems  2,500   1,100   45.5   2,500   1.3   900   36.6   1,800   0.9   400   17.5   700   0.4  
                                                     
Transfers as a percentage
of enrollment7
                                                   
Less than 6 percent  23,600   6,400   27.3   13,100   0.9   5,500   23.5   10,400   0.7   1,800   7.7   2,700   0.2  
6 to less than 11 percent  18,800   4,900   25.9   8,100   0.8   4,400   23.5   6,800   0.6   1,000   5.2   1,300   0.1 !
11 to less than 21 percent  22,800   7,700   33.7   15,500   1.2   6,500   28.6   12,200   0.9   1,900   8.4   3,200   0.2  
21 percent or more  18,500   6,500   35.3   14,200   1.3   5,200   28.3   10,900   1.0   2,300   12.7   3,300   0.3  
                                                     
Percent of students
absent on a daily basis 
                                                   
0–2 percent  8,100   1,800   22.7   2,800   0.7   1,700   20.9   2,300   0.6   400 ! 5.0 ! 400 ! 0.1 !
3–5 percent  47,200   14,000   29.6   27,400   1.0   11,900   25.1   22,400   0.8   3,400   7.3   5,100   0.2  
6–10 percent  22,600   7,400   32.8   15,300   1.1   6,100   26.8   11,400   0.8   2,500   11.0   3,900   0.3  
More than 10 percent  5,700   2,300   40.0   5,400   1.7   2,100   36.4   4,200   1.4   700   13.0   1,100 ! 0.4  
                                                     
Prevalence of violent incidents8                                                    
No violent incidents 26,000   5,000   19.3   10,000   0.9   4,300   16.4   8,600   0.8   1,200   4.5   1,400   0.1 !
Any violent incidents 57,600   20,500   35.5   40,900   1.1   17,400   30.2   31,700   0.8   5,900   10.2   9,100   0.2  
! Interpret data with caution. The standard error for this estimate is from 30 percent to 50 percent of the estimate's value.
1 Primary schools are defined as schools in which the lowest grade is not higher than grade 3 and the highest grade is not higher than grade 8. Middle schools are defined as schools in which the lowest grade is not lower than grade 4 and the highest grade is not higher than grade 9. High schools are defined as schools in which the lowest grade is not lower than grade 9 and the highest grade is not higher than grade 12. Combined schools include all other combinations of grades, including K–12 schools.
2 Respondents were asked, "How would you describe the crime level in the area(s) in which your students live?" Response options included "high level of crime," "moderate level of crime," "low level of crime," and "students come from areas with very different levels of crime."
3 Student-to-FTE ratio was calculated by dividing the total number of students enrolled in the school by the total number of full-time-equivalent teachers and aides. The total number of full-time-equivalent teachers and aides is a combination of the full-time and part-time teachers and aides, including special education teachers and aides, with an adjustment to compensate for the part-time status.
4Respondents were asked, "How many classroom changes do most students make in a typical day?" Responses exclude morning arrival and afternoon departure.
5Regular use of security staff includes full- or part-time school resource officers, sworn law enforcement officers, or security guards or security personnel present at school at least once a week.
6Serious discipline problems include student racial/ethnic tensions, student bullying, student sexual harassment of other students, student harassment of other students based on sexual orientation, student harassment of other students based on gender identity, widespread disorder in classrooms, student verbal abuse of teachers, student acts of disrespect for teachers other than verbal abuse, and gang activities. If a respondent reported that any of these problems occurred daily or weekly in their school, each was counted once in the total number of serious discipline problems.
7 Transfers as a percentage of enrollment combines the number of students who were transferred to a school and the number of students who were transferred from a school divided by the total number of students enrolled in the school.
8Violent incidents include rape or attempted rape, sexual assault other than rape (including threatened rape), physical attack or fight with or without a weapon, threat of physical attack with or without a weapon, and robbery (taking things with force) with or without a weapon.
NOTE: "At school" was defined for respondents to include activities happening in school buildings, on school grounds, on school buses, and at places that hold school-sponsored events or activities. Detail may not sum to totals because of rounding. Responses were provided by the principal or the person most knowledgeable about crime and safety issues at the school.
SOURCE: U.S. Department of Education, National Center for Education Statistics, 2015–16 School Survey on Crime and Safety (SSOCS), 2016.