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Date of survey

:

January 14 to 21, 2013

Survey method

:

Telephone survey conducted by telephone interviewers

Target population

:

Hong Kong citizens aged between 18 and 60 year old, who speak Cantonese, own at least one computer or mobile device (including PCs, laptops, smartphones, tablets, and so on), and living with at least one other family members

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

:

517 successful cases

Effective response rate

:

74.6%

Std. sampling error

:

At 95% confidence level, the maximum sampling error of all percentages should be no more than +/-4.4 percentage points