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Date of survey

:

19 November to 9 December, 2013

Survey method

:

Telephone survey conducted by telephone interviewers

Target population

:

Hong Kong citizens aged 15-24 who speak Cantonese

Sampling method

:

Telephone numbers were selected randomly from residential telephone directories and mixed with additional numbers generated by the computer. If more than one eligible subject had been available, the one who had his/her birthday next was selected. If the selected respondent were aged 15-17, parental consent would be sought at the beginning of questionnaire after the introduction.

Sample size

:

506 successful cases

Effective response rate

:

69.4%

Sampling error

:

At 95% confidence level, the maximum sampling error of all percentages should be no more than +/-4.4 percentage points, while the sampling error of rating figures needs another calculation.