Table 2.
Demographic and clinical characteristics of TMD patients with and without SB. (1) Before propensity score matching. (2) After propensity score matching.
| (1) Before Propensity Score Matching | ||||
|---|---|---|---|---|
| SB | ||||
| Yes (=Presence) | No (=Absence) | p–Value | ||
| Age (years) | 43.6 (28–57.8) (N = 484) |
53.4 (29.9–67.9) (N = 1804) |
<0.001 | |
| Gender | Female | 352 (21.3%) | 1301 (78.7%) | 0.995 |
| (N = 2292) | Male | 136 (21.3%) | 503 (78.7%) | |
| Medical history of TMJ (N = 2211) |
Yes and Same | 121 (24%) | 383 (76%) | <0.001 |
| Yes and Difference | 146 (25.7%) | 421 (74.3%) | ||
| No | 205 (18%) | 935 (82%) | ||
| TMD treatment | Yes | 128 (24.1%) | 403 (75.9%) | 0.079 |
| (N = 2269) | No | 357 (20.5%) | 1381 (79.5%) | |
| Systemic history | Yes | 95 (19%) | 405 (81%) | 0.153 |
| (N = 2276) | No | 390 (22%) | 1386 (78%) | |
| Head and neck injury | Yes | 89 (23.8%) | 285 (76.2%) | 0.205 |
| (N = 2277) | No | 397 (20.9%) | 1506 (79.1%) | |
| Orthodontic treatment | Yes | 70 (29.4%) | 168 (70.6%) | 0.001 |
| (N = 2285) | No | 418 (20.4%) | 1629 (79.6%) | |
| Chewing side (N = 2257) |
Both side | 174 (20.1%) | 691 (79.9%) | 0.147 |
| Right side | 164 (20.3%) | 642 (79.7%) | ||
| Left side | 141 (24.1%) | 445 (75.9%) | ||
| Nervous person | Yes | 336 (23.3%) | 1106 (76.7%) | 0.003 |
| (N = 2262) | No | 147 (17.9%) | 673 (82.1%) | |
| Desk work and recreation | Yes | 294 (23.9%) | 936 (76.1%) | 0.002 |
| (N = 2217) | No | 183 (18.5%) | 804 (81.5%) | |
| SB | Yes | 278 (34.4%) | 530 (65.6%) | <0.001 |
| (N = 2292) | No | 210 (14.2%) | 1274 (85.8%) | |
| CH | Yes | 141 (25.8%) | 405 (74.2%) | 0.003 |
| (N = 2292) | No | 347 (19.9%) | 1399 (80.1%) | |
| FD | Yes | 93 (25.1%) | 277 (74.9%) | 0.049 |
| (N = 2292) | No | 395 (20.6%) | 1527 (79.4%) | |
| BP | Yes | 243 (24.4%) | 752 (75.6%) | 0.001 |
| (N = 2292) | No | 245 (18.9%) | 1052 (81.1%) | |
| (2) After Propensity Score Matching | ||||
| SB | ||||
| Yes (=Presence) | No (=Absence) | p –Value | ||
| Age (years) | 43.4 (27.4–58.4) (N = 452) |
43.6 (24.1–59.8) (N = 452) |
0.873 | |
| Gender | Female | 330 (50.5%) | 323 (49.5%) | 0.603 |
| (N = 904) | Male | 122 (48.6%) | 129 (51.4%) | |
| Medical history of TMJ (N = 904) |
Yes and Same | 116 (48.9%) | 121 (51.1%) | 0.920 |
| Yes and Difference | 137 (50.7%) | 133 (49.3%) | ||
| No | 199 (50.1%) | 198 (49.9%) | ||
| TMD treatment | Yes | 121 (48%) | 131 (52%) | 0.458 |
| (N = 904) | No | 331 (50.8%) | 321 (49.2%) | |
| Systemic history | Yes | 91 (50%) | 91 (50%) | 1.000 |
| (N = 904) | No | 361 (50%) | 361 (50%) | |
| Head and neck injury | Yes | 88 (49.7%) | 89 (50.3%) | 0.933 |
| (N = 904) | No | 364 (50.1%) | 363 (49.9%) | |
| Orthodontic treatment | Yes | 63 (52.1%) | 58 (47.9%) | 0.625 |
| (N = 904) | No | 389 (49.7%) | 394 (50.3%) | |
| Chewing side (N = 940) |
Both side | 164 (47.4%) | 182 (52.6%) | 0.465 |
| Right side | 150 (51.4%) | 142 (48.6%) | ||
| Left side | 138 (51.9%) | 128 (48.1%) | ||
| Nervous person | Yes | 311 (49.8%) | 313 (50.2%) | 0.886 |
| (N = 904) | No | 141 (50.4%) | 139 (49.6%) | |
| Desk work and recreation | Yes | 278 (50.5%) | 273 (49.5%) | 0.733 |
| (N = 904) | No | 174 (49.3%) | 179 (50.7%) | |
| DC | Yes | 255 (49.7%) | 258 (50.3%) | 0.840 |
| (N = 904) | No | 197 (50.4%) | 194 (49.6%) | |
| CH | Yes | 132 (49.8%) | 133 (50.2%) | 0.942 |
| (N = 904) | No | 320 (50.1%) | 319 (49.9%) | |
| FD | Yes | 86 (47.8%) | 94 (52.2%) | 0.505 |
| (N = 904) | No | 366 (50.6%) | 358 (49.4%) | |
| BP | Yes | 221 (49.1%) | 229 (50.9%) | 0.595 |
| (N = 904) | No | 231 (50.9%) | 223 (49.1%) | |