人口變項
Demographic profile of respondents
20-24/11/06
11-15/8/06
18-25/5/06
9-14/2/06
18-23/11/05
22-25/8/05
5-9/8/05
21-24/5/05
3-6/5/05
17-20/2/05
14-16/2/05