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Date of survey

:

April 16 to 25, 2013

 

Survey method

:

Telephone survey conducted by female telephone interviewers

 

Target population

:

Cantonese-speaking female citizens in Hong Kong of age 18 to 45 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 her birthday next was selected.

 

Sample size

:

503 successful cases

 

Effective response rate

:

53.4%

 

Std. sampling error

:

At 95% confidence level, the maximum sampling error of all percentages should be no more than +/-4.5 percentage points