Table 3 Frequency of orthodontics publicity and orthodontic treatment history by backgrounds of participants
From: A survey regarding orthodontic treatment among contemporary college freshmen in China
|  | Have you ever heard of orthodontics? | Chi-square P | χ2 | Do you have experience of orthodontics treatment? | Chi-square P | χ2 | ||||
|---|---|---|---|---|---|---|---|---|---|---|
Yes N (%) | No N (%) | Total N (%) | Yes N (%) | No N (%) | Total N (%) | |||||
Gender | Â | Â | Â | 0.072 | 3.230 | Â | Â | Â | 0.564 | 0.333 |
 Female | 1594 (89.35%) | 190 (10.65%) | 1784 (53.93%) |  |  | 876 (49.10%) | 908 (50.90%) | 1784 (53.93%) |  |  |
 Male | 1328 (87.14%) | 196 (12.86%) | 1524 (46.07%) |  |  | 733 (48.10%) | 791 (51.90%) | 1524 (46.07%) |  |  |
Economic Administrative Regions | Â | Â | Â | 0.000** | 28.070 | Â | Â | Â | 0.000** | 56.439 |
 The central region | 442 (89.66%) | 51 (10.34%) | 493 (14.90%) |  |  | 183 (37.12%) | 310 (62.88%) | 493 (14.90%) |  |  |
 The northeast region | 161 (84.29%) | 30 (15.71%) | 191 (5.77%) |  |  | 87 (45.55%) | 104 (54.45%) | 191 (5.77%) |  |  |
 The eastern region | 902 (87.40%) | 130 (12.60%) | 1032 (31.20%) |  |  | 466 (45.16%) | 566 (54.84%) | 1032 (31.20%) |  |  |
 The western region | 1376 (89.76%) | 157(10.24%) | 1533 (46.35%) |  |  | 840 (54.79%) | 693 (45.21%) | 1533 (46.35%) |  |  |
 Hong Kong, Macao, Taiwan and Overseas | 41 (69.49%) | 18 (30.51%) | 59 (1.78%) |  |  | 33 (55.93%) | 26 (44.07%) | 59 (1.78%) |  |  |
Age | Â | Â | Â | 0.010** | 6.551 | Â | Â | Â | 0.003** | 8.834 |
 16–19 | 2519 (88.92%) | 314 (11.08%) | 2833 (85.64%) |  |  | 1348 (47.58%) | 1485 (52.42%) | 2833 (85.64%) |  |  |
 20–25 | 403 (84.84%) | 72 (15.16%) | 475 (14.36%) |  |  | 261 (54.95%) | 214 (45.05%) | 475 (14.36%) |  |  |
Major | Â | Â | Â | 0.000** | 21.842 | Â | Â | Â | 0.021* | 5.319 |
 Medicine | 539 (83.05%) | 110 (16.95%) | 649 (19.62%) |  |  | 342 (52.70%) | 307 (47.30%) | 649 (19.62%) |  |  |
 Non-medicine | 2383 (89.62%) | 276 (10.38%) | 2659 (80.38%) |  |  | 1267 (47.65%) | 1392 (52.35%) | 2659 (80.38%) |  |  |
Do you have any relatives or friends engaged in orthodontics? | Â | Â | Â | 0.000** | 44.624 | Â | Â | Â | 0.000** | 157.621 |
 No | 1670 (90.36%) | 178 (9.63%) | 1848 (55.86%) |  |  | 732 (39.61%) | 1116 (60.39%) | 1848 (55.86%) |  |  |
 Not sure | 305 (78.41%) | 84 (21.59%) | 389 (11.76%) |  |  | 195 (50.13%) | 194 (49.87%) | 389 (11.76%) |  |  |
 Yes | 947 (88.42%) | 124 (11.58%) | 1071 (32.38%) |  |  | 682 (63.68%) | 389 (36.32%) | 1071 (32.38%) |  |  |
Total | 2922 (88.33%) | 386 (11.67%) | 3308 (100.00%) | Â | Â | 1609 (48.64%) | 1699 (51.36%) | 3308 (100.00%) | Â | Â |