...for physically or mentally handicapped students, schools for legally confined students, and schools (such as area vocational schools) where students were also enrolled in other schools included in the sampling frame. The study design also excluded certain categories of students...

...for physically or mentally handicapped students, schools for legally c °1fined students, and schools (such as area vocational schools) where students were also enrolled in other institutions included in the sampling frame. Also excluded were special categories of students, such...

...physically or mentally handicapped, those for legally confined students, and the special situation (such as area vocational schools) where students were...enrolled in other high schools in the sampling frame. Within a school, early graduates and those attending adult education classes were also excluded from...