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Date of survey

:

August 26 to September 18, 2013

 

Survey method

:

Telephone survey conducted by male telephone interviewers

 

Target population

:

Cantonese-speaking male citizens in Hong Kong aged 40-70

 

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 birthday next was selected.

 

Sample size

:

1,008 successful cases

 

Effective response rate

:

80.1%

 

Std. sampling error

:

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