With random to make a comparison between the assessment of students-students and the general public has found that teenagers (students-students) have to use cell phones than adults (individuals)
Patients were randomly assigned to a comparison between the rate of students - students. And the general adolescent (student - student) are using mobile phones than adults (guests).
The random to make assessment of comparison between students and the general public, there are teens (students) are using mobile phones than adults (general public) .