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Date of survey

:

May 21 to June 9, 2014

 

Survey method

:

Telephone survey conducted by telephone interviewers

 

Target population

:

Cantonese-speaking citizens in Hong Kong of age 18 to 65 years

 

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

:

1,013 successful cases

 

Effective response rate

:

72.3%

 

Std. sampling error

:

At 95% confidence level, the maximum sampling error of all percentages should be no more than +/-3.1 percentage points