Table 2.

Distribution of demographic characteristics of respondents by city (%)

Variables	Groups	Hanoi (N=6204)	Shanghai (N=6023)	Taipei (N=4327)
Age	15–17	23.8	32.1	27.5
	18–20	35.9	37.2	33.0
	21–24	40.3	30.7	39.5
Gender	Male	52.5	50.2	51.3
	Female	47.5	49.8	48.7
Residence	Urban	71.8	73.4	87.9
	Rural	28.2	26.6	12.1
Student	Yes	66.3	67.1	82.8
	No	33.7	32.9	17.2
Education	≤ High school	50.3	58.5	47.2
	College	20.4	17.8	5.1
	≥ University	29.3	23.7	47.7
Economic status	Low	31.1	22.0	36.2
	Middle	40.3	38.0	24.1
	High	28.6	40.0	39.7