Table 2.
Demographic characteristics and the FAI survey results of TMD-free patients, TMD patients without TMJ pain, and TMD patients with TMJ pain.
| TMD-free | TMD without TMJ pain | TMD with TMJ pain | P | ||
|---|---|---|---|---|---|
| Number (n (%)) | 169 (44.01%) | 147 (38.28%) | 68 (17.71%) | ||
|
| |||||
| Gender (n (%)) | Male | 62 (48.06%) | 42 (32.56%) | 25 (19.38%) | 0.265 |
| Female | 107 (41.96%) | 105 (41.18%) | 43 (16.86%) | ||
|
| |||||
| Age | Mean ± SD | 21.82 ± 8.09 | 25.02 ± 6.67 | 23.29 ± 6.74 | <0.001∗ |
| Median (IQR) | 20.08 (14.58, 27.71)a | 24.83 (19.75, 29.02)b | 22.71 (18.35, 27.03)a,b | ||
|
| |||||
| Educational level (n (%)) | Senior high school or lower | 25 (22.94%)a | 19 (17.43%)a,b | 65 (59.63%)b | <0.001∗ |
| Undergraduate | 98 (44.14%)a | 36 (16.22%)a,b | 88 (39.64%)b | ||
| Graduate or higher | 24 (45.28%)a | 13 (24.53%)a | 16 (30.19%)a | ||
|
| |||||
| Residence (n (%)) | Urban | 14 (35.90%) | 9 (23.08%) | 16 (41.02%) | 0.677 |
| Rural | 133 (38.55%) | 59 (17.10%) | 153 (44.35%) | ||
|
| |||||
| Family per capita monthly income (n (%)) | <3000 yuan | 15 (50.00%) | 4 (13.33%) | 11 (36.67%) | 0.448 |
| 3000–6000 | 53 (40.77%) | 25 (19.23%) | 52 (40.00%) | ||
| >6000 yuan | 79 (35.27%) | 39 (17.41%) | 106 (47.32%) | ||
|
| |||||
| FAI scores | Mean ± SD | 7.25 ± 5.69 | 29.90 ± 9.80 | 46.18 ± 14.82 | <0.001∗ |
| Median (IQR) | 5 (0, 15)a | 25 (20, 35)b | 45 (35, 55)c | ||
|
| |||||
| TMD severity (n (%)) | Mild TMD | — | 127 (82.47%) | 27 (15.73%) | <0.001∗ |
| Moderate/severe TMD | — | 20 (32.79%) | 41 (67.21%) | ||
Notes: The chi-squared test and the Kruskal–Wallis H-test were used. Different superscript letters indicate significant differences, and ∗P < 0.05. TMD, temporomandibular disorders; TMJ, temporomandibular joint; FAI, the Fonseca Anamnestic Index; SD, standard deviation; IQR, interquartile range.