A total of 6,010 (2,975 males and 3,035 females)[1] high-school students in Hong Kong
participated in the present study. The mean age was 14.35 years old with a standard
deviation of 3.13 years. Among the participants, 68.5 per cent (n ¼ 4,117) were aged
from 13 to 15; 31.1 per cent (n ¼ 1,869) from 16-18; and the remaining 0.4 per cent
(n ¼ 24) were unidentified.
Procedures
A list containing all high-schools in Hong Kong was first obtained from its education
department. About 202 schools were randomly selected from the list. A letter was sent
to the principal of each of the school with objectives and procedures of the present
study stated. A total of 48 schools agreed to participate. Students were
group-administered the surveys in one of their classes. The questionnaire took
approximately 15 min to complete.
A total of 6,010 (2,975 males and 3,035 females)[1] high-school students in Hong Kongparticipated in the present study. The mean age was 14.35 years old with a standarddeviation of 3.13 years. Among the participants, 68.5 per cent (n ¼ 4,117) were agedfrom 13 to 15; 31.1 per cent (n ¼ 1,869) from 16-18; and the remaining 0.4 per cent(n ¼ 24) were unidentified.ProceduresA list containing all high-schools in Hong Kong was first obtained from its educationdepartment. About 202 schools were randomly selected from the list. A letter was sentto the principal of each of the school with objectives and procedures of the presentstudy stated. A total of 48 schools agreed to participate. Students weregroup-administered the surveys in one of their classes. The questionnaire tookapproximately 15 min to complete.
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