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Date of survey

:

July 14 to 25, 2014

Survey method

:

Telephone survey conducted by telephone interviewers

Target population

:

Cantonese-speaking local working class of age 18-64 who are MPF members

Sampling method

:

Telephone numbers are randomly generated using known prefixes assigned to telecommunication services providers under the Numbering Plan provided by the Office of the Communications Authority (OFCA). Invalid numbers are then eliminated according to computer and manual dialing records to produce the final sample. If more than one subject had been available, the one who had his/her birthday next was selected.

Sample size

:

1,020 successful cases

Effective response rate

:

80.4%

Std. sampling error

:

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