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Date of survey

:

11 to 20 April, 2013

 

Survey method

:

Telephone survey conducted by telephone interviewers

 

Target population

:

Hong Kong citizens aged 18-65 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.

 

Sample size

:

535 successful cases

 

Response rate

:

72.3%

 

Std. sampling error

:

At 95% confidence level, the maximum sampling error of all percentages should be no more than +/-4.3 percentage points