Items | Number N (%) | Cities | χ2 | P# | ||
---|---|---|---|---|---|---|
Beijing N (%) | Shenzhen N (%) | Kunming N (%) | ||||
Age (years) | 4698 | 2780 | 826 | 1092 | 720.271 | < 0.001 |
 18 and under | 532 (11.3) | 494 (17.8) | 21 (2.5) | 17 (1.5) |  |  |
 19- | 992 (21.1) | 744 (26.8) | 189 (22.9) | 59 (5.4) |  |  |
 20- | 1343 (28.6) | 671 (24.1) | 276 (33.4) | 396 (36.3) |  |  |
 21- | 1005 (21.4) | 372 (13.4) | 205 (24.8) | 428 (39.2) |  |  |
 22–24 | 826 (17.6) | 499 (17.9) | 135 (16.4) | 192 (17.6) |  |  |
Gender | 4698 | 2780 | 826 | 1092 | 217.211 | < 0.001 |
 Male | 2213 (47.1) | 1512 (54.4) | 210 (25.4) | 490 (44.9) |  |  |
 Female | 2485 (52.9) | 1268 (45.6) | 616 (74.6) | 602 (55.1) |  |  |
Education level | 4698 | 2780 | 826 | 1092 | 23.977 | < 0.001 |
 Undergraduate | 4605 (98.0) | 2702 (97.2) | 820 (99.3) | 1083 (99.2) |  |  |
 Postgraduate | 93 (2.0) | 78 (2.8) | 6 (0.7) | 9 (0.8) |  |  |
Monthly income (RMB yuan) | 4698 | 2780 | 826 | 1092 | 79.026 | < 0.001 |
 No income | 3730 (79.4) | 2184 (78.6) | 595 (72.0) | 951 (87.1) |  |  |
 0–1000 | 465 (9.9) | 262 (9.4) | 126 (15.3) | 77 (7.0) |  |  |
  > 1000 | 503 (10.7) | 334 (12.0) | 105 (12.7) | 64 (5.9) |  |  |
Sexual behavior | 4698 | 2780 | 826 | 1092 | 62.305 | < 0.001 |
 Homosexual | 293 (6.2) | 133 (4.8) | 47 (5.7) | 113 (10.3) |  |  |
 Heterosexual | 676 (14.4) | 446 (16.0) | 105 (12.7) | 125 (11.4) |  |  |
 Bisexual | 53 (1.1) | 23 (0.9) | 9 (1.1) | 21 (1.9) |  |  |
 No sexual* | 3676 (78.3) | 2178 (78.3) | 665 (80.5) | 833 (76.3) |  |  |