Table 3.
Association of demographics with masticatory muscle thicknesses (expressed by the beta coefficients and their 95% confidence intervals).
| Upper masseter (relaxation) | Upper masseter (clenching) | Upper masseter (maximal opening) | Middle masseter (relaxation) | Middle masseter (clenching) | Middle masseter (maximal opening) | Lower masseter (relaxation) | Lower masseter (clenching) | Lower masseter (maximal opening) | Temporalis (relaxation) | Temporalis (clenching) | Temporalis (maximal opening) | Lateral pterygoid (maximal opening) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age (year) | − 0.02 (− 0.05 to 0.01) | − 0.02 (− 0.05 to 0.01) | 0.01 (− 0.025 to 0.047) | < 0.001 (− 0.03 to 0.03) | < 0.001 (− 0.03 to 0.03) | 0.02 (− 0.01 to 0.06) | 0.05 (0.01 to 0.08) | 0.06 (0.02 to 0.10) | 0.05 (0.01 to 0.09) | 0.01 (0.00 to 0.02) | 0.01 (0.00 to 0.02) | 0.01 (0.00 to 0.02) | 0.02 (0.01 to 0.04) |
| p = 0.120 | p = 0.206 | p = 0.536 | p = 0.972 | p = 0.907 | p = 0.230 | p = 0.017* | p = 0.003* | p = 0.010* | p = 0.106 | p = 0.282 | p = 0.079 | p = 0.006* | |
| Female gender | − 0.81 (− 1.86 to 0.24) | − 1.23 (− 2.37 to − 0.09) | − 1.08 (− 2.477 to 0.311) | − 1.12 (− 2.30 to 0.06) | − 1.10 (− 2.40 to 0.20) | − 1.52 (− 2.97 to − 0.08) | − 1.02 (− 2.44 to 0.40) | − 1.30 (− 2.90 to 0.29) | − 1.34 (− 2.97 to 0.29) | − 0.29 (− 0.63 to 0.06) | − 0.34 (− 0.68 to 0.01) | − 0.31 (− 0.66 to 0.04) | − 0.74 (− 1.32 to − 0.16) |
| p = 0.132 | p = 0.034* | p = 0.128 | p = 0.063 | p = 0.098 | p = 0.039* | p = 0.158 | p = 0.108 | p = 0.108 | p = 0.101 | p = 0.056 | p = 0.079 | p = 0.013* | |
| Left side | 0.59 (0.10 to 1.08) | 0.39 (− 0.03 to 0.80) | 0.23 (− 0.185 to 0.648) | 0.02 (− 0.41 to 0.44) | − 0.20 (− 0.69 to 0.29) | − 0.05 (− 0.50 to 0.40) | 0.26 (− 0.22 to 0.73) | 0.01 (− 0.57 to 0.59) | − 1.34 (− 2.97 to 0.29) | − 0.11 (− 0.25 to 0.04) | − 0.04 (− 0.20 to 0.11) | − 0.12 (− 0.26 to 0.01) | 0.03 (− 0.22 to 0.29) |
| p = 0.018* | p = 0.071 | p = 0.277 | p = 0.936 | p = 0.420 | p = 0.829 | p = 0.285 | p = 0.970 | p = 0.108 | p = 0.145 | p = 0.583 | p = 0.065 | p = 0.805 | |
| Body mass index | 0.13 (− 0.03 to 0.28) | 0.15 (− 0.02 to 0.31) | 0.11 (− 0.071 to 0.295) | 0.16 (− 0.02 to 0.34) | 0.15 (− 0.05 to 0.35) | 0.14 (− 0.07 to 0.34) | 0.16 (− 0.09 to 0.42) | 0.14 (− 0.14 to 0.41) | 0.10 (− 0.17 to 0.37) | 0.07 (0.02 to 0.12) | 0.07 (0.02 to 0.01) | 0.07 (0.01 to 0.12) | 0.01 (− 0.09 to 0.11) |
| p = 0.106 | p = 0.078 | p = 0.232 | p = 0.081 | p = 0.153 | p = 0.191 | p = 0.212 | p = 0.339 | p = 0.459 | p = 0.008* | p = 0.011* | p = 0.013* | p = 0.842 |
*p < 0.05.