Table 1 Characteristics of study participants in Shanghai, Fuzhou, and Chengdu (n = 8990)
Characteristics | n(%) or Mean ± SD |
|---|---|
Place | |
 Shanghai | 3788(42.14) |
 Fuzhou | 2258(25.12) |
 Chengdu | 2944(32.74) |
Age | 29.55 ± 11.63 |
Sex | |
 Male | 5033(55.98) |
 Female | 3957(44.02) |
Marriage | |
 Unmarried | 5323(59.21) |
 Married | 3278(36.46) |
 Divorce | 224(2.49) |
 Widow/widower | 26(0.29) |
 Else | 139(1.55) |
Education | |
 Illiteracy and primary school | 107(1.19) |
 Junior high school | 1038(11.55) |
 Senior high school | 1232(13.70) |
 University and junior college | 5678(63.16) |
 Master and above | 935(10.40) |
Occupation | Â |
 Farmer | 170(1.89) |
 Civil servant | 147(1.64) |
 Teacher | 327(3.64) |
 Medical staff | 104(1.16) |
 White-collar | 2081(23.15) |
 Student | 4024(44.76) |
 Worker | 723(8.04) |
 Freelance work | 536(5.96) |
 Housework and unemployment | 64(0.71) |
 Else | 814(9.05) |
Monthly Income in family (Â¥) | |
  < 5000 | 2342(26.05) |
  >  = 5000 and < 10,000 | 2758(30.68) |
  >  = 10,000 and < 20,000 | 1683(18.72) |
  >  = 20,000 and < 50,000 | 1074(11.95) |
  >  = 50,000 | 1133(12.60) |
Disability | |
 Yes | 102(1.13) |
 No | 8888(98.87) |