Table 1 Characteristics of the study participantscompared to the whole Hong Kong Population

Total numbers of schools

24

1018

 Number of primary schools

12

528^a

 Number of secondary schools

12

490^a

Total numbers of students

4631

736,229

 Number of primary schoolsstudents

687

317,442^a

 Number of secondary schools students

3944

418,787^a

Level of education of respondents

 Primary school level or below^c

11.0 %

29.4 %^b

 Secondary school level^c

72.6 %

54.8 %^b

 Tertiary or above

16.4 %

15.8 %^b