Table 1 Demographic characteristics

Residence

Urban

498(36.03%)

753(54.06%)

757(50.94%)

2008(47.13%)

Rural

884(63.97%)

640(45.94%)

729(49.06%)

2253(52.87%)

Gender

Male

545(39.32%)

638(46.16%)

660(44.41%)

1843(43.32%)

Female

841(60.68%)

744(53.84%)

826(55.59%)

2411(56.68%)

Age (years)

Younger than 31

622(46.77%)

723(52.74%)

884(59.61%)

2229(53.27%)

31–40

376(28.27%)

364(26.55%)

304(20.50%)

1044(24.95%)

Older than 40

332(24.96%)

284(20.71%)

295(19.89%)

911(21.77%)

Marital status

Others

407(29.43%)

735(52.80%)

892(60.07%)

2034(47.75%)

Married

976(70.57%)

657(47.20%)

593(39.93%)

2226(52.25%)

Education

Less than Primary school

88(6.34%)

56(4.02%)

87(5.86%)

231(5.41%)

Middle-High school

642(46.29%)

485(34.79%)

473(31.85%)

1600(37.51%)

More than University

657(47.37%)

853(61.19%)

925(62.29%)

2435(57.08%)

Employment

No

909(65.49%)

740(53.12%)

902(60.70%)

2551(59.78%)

Yes

479(34.51%)

653(46.88%)

584(39.30%)

1716(40.22%)

Monthly income (Ren Min Bi)

Less than 3300

818(60.59%)

613(44.32%)

651(43.81%)

2082(49.35%)

3300–5999

331(24.52%)

452(32.68%)

390(26.24%)

1173(27.80%)

6000–9999

137(10.15%)

238(17.21%)

267(17.97%)

642(15.22%)

More than 9999

64(4.74%)

80(5.78%)

178(11.98%)

322(7.63%)