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Average class size in private schools, by class type and affiliation: 2017–18

  Elementary schools   Secondary schools   Combined grade schools  
Affiliation Average class size for teachers in self-contained classes   Average class size
for teachers in
departmentalized
instruction
  Average class size for teachers in self-contained classes   Average class size
for teachers in
departmentalized
instruction
  Average class size for teachers in self-contained classes   Average class size
for teachers in
departmentalized
instruction
 
All private schools 16.7   17.6   17.8   17.7      
                         
Catholic, Parochial 18.9   20.0   22.5   20.6      
Catholic, Diocesan 18.3   19.8   21.3   20.5      
Catholic, Private 17.1   15.3   17.2   19.8      
Baptist 11.3   13.0   11.5   17.2      
Jewish            
Lutheran 14.3   17.1     18.6      
Seventh-Day Adventist 14.9   18.1   20.0   17.4      
All Other Religious            
Non-sectarian, Regular            
Non-sectarian, Special Emphasis 17.6   14.8   14.7   11.9      
Non-sectarian, Special Education 7.5   8.2   10.3   8.1      
‡ 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) or the response rate is below 50 percent.
NOTE: Self-contained classes are defined as instruction to the same group of students all or most of the day in multiple subjects, and departmentalized instruction is defined as instruction to several classes of different students most or all of the day in one or more subjects. Among all private school teachers, 16 percent teach self-contained classes in elementary schools and 3 percent in secondary schools; 12 percent teach departmentalized classes in elementary schools and 19 percent in secondary schools; 10 percent teach other types of classes, such as elementary subject specialist classes, team-taught classes, and "pull-out" or "push-in" classes in elementary schools and 3 percent in secondary schools.
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Teacher and Principal Survey (NTPS), "Private School Teacher Data File," 2017–18.