Table 1 Intra- and inter-rater evaluations and corresponding differences of ultrasound muscle thickness measurements.
1st rater 1st evaluation in mm (95% CI) | 1st rater 2nd evaluation in mm (95% CI) | 2nd rater 1st evaluation in mm (95% CI) | Intra-rater mean difference in mm (95% CI) | p value | Inter-rater mean difference in mm (95% CI) | p value | |
|---|---|---|---|---|---|---|---|
Upper masseter (relaxation) | 15.48 ± 1.75 (14.71 to 16.25) | 15.45 ± 1.81 (14.66 to 16.24) | 14.78 ± 1.59 (14.08 to 15.48) | − 0.02 ± 0.94 (− 0.43 to 0.39) | 0.907 | − 0.69 ± 0.35 (− 1.04 to − 0.34) | 0.001* |
Upper masseter (clenching) | 16.26 ± 1.88 (15.43 to 17.09) | 16.20 ± 1.83 (15.40 to 17.00) | 15.53 ± 1.62 (14.82 to 16.24) | − 0.01 ± 0.96 (− 0.43 to 0.41) | 0.784 | − 0.73 ± 1.11 (− 1.21 to − 0.25) | 0.008* |
Upper masseter (maximal opening) | 16.10 ± 2.15 (15.16 to 17.04) | 15.91 ± 1.78 (15.13 to 16.69) | 15.99 ± 1.87 (15.17 to 16.81) | − 0.27 ± 1.55 (− 0.95 to 0.41) | 0.562 | − 0.11 ± 0.58 (− 0.69 to 0.47) | 0.719 |
Middle masseter (relaxation) | 14.85 ± 1.66 (14.12 to 15.58) | 14.85 ± 2.37 (13.81 to 15.89) | 13.67 ± 1.99 (12.80 to 14.54) | 0.00 ± 1.23 (− 0.54 to 0.54) | 0.981 | − 1.18 ± 1.40 (− 1.79 to − 0.57) | 0.001* |
Middle masseter (clenching) | 15.63 ± 1.87 (14.81 to 16.45) | 15.65 ± 2.40 (14.6 0to 16.70) | 14.85 ± 2.06 (13.95 to 15.75) | − 0.09 ± 1.16 (− 0.6 to 0.42) | 0.937 | − 0.78 ± 1.35 (− 1.37 to − 0.19) | 0.018* |
Middle masseter (maximal opening) | 14.69 ± 2.17 (13.74 to 15.64) | 14.93 ± 2.25 (13.94 to 15.92) | 13.99 ± 2.13 (13.06 to 14.92) | 0.28 ± 1.25 (− 0.27 to 0.83) | 0.403 | − 0.70 ± 1.33 (− 1.28 to − 0.12) | 0.029* |
Lower masseter (relaxation) | 11.12 ± 2.52 (10.01 to 12.23) | 12.03 ± 2.63 (10.88 to 13.18) | 11.72 ± 2.69 (10.54 to 12.90) | 0.85 ± 1.85 (0.04 to 1.66) | 0.040* | 0.60 ± 2.03 (− 0.29 to 1.49) | 0.202 |
Lower masseter (clenching) | 11.53 ± 2.57 (10.4 to 12.66) | 12.57 ± 2.75 (11.36 to 13.78) | 12.52 ± 2.57 (11.4 to 13.64) | 0.96 ± 2.10 (0.04 to 1.88) | 0.039* | 1.00 ± 1.96 (0.14 to 1.86) | 0.035* |
Lower masseter (maximal opening) | 11.56 ± 2.12 (10.63 to 12.49) | 11.95 ± 2.75 (10.75 to 13.15) | 11.57 ± 2.54 (10.46 to 12.68) | 0.37 ± 1.38 (− 0.23 to 0.97) | 0.223 | 0.01 ± 1.31 (− 0.56 to 0.58) | 0.981 |
Temporalis (relaxation) | 5.09 ± 0.79 (4.74 to 5.44) | 5.14 ± 0.69 (4.84 to 5.44) | 5.16 ± 1.07 (4.69 to 5.63) | 0.05 ± 0.57 (− 0.2 to 0.3) | 0.466 | 0.08 ± 0.63 (− 0.31 to 0.47) | 0.599 |
Temporalis (clenching) | 5.12 ± 0.76 (4.79 to 5.45) | 5.09 ± 0.62 (4.82 to 5.36) | 5.25 ± 1.03 (4.80 to 5.70) | − 0.03 ± 0.49 (− 0.25 to 0.19) | 0.759 | 0.12 ± 0.50 (− 0.10 to 0.34) | 0.364 |
Temporalis (maximal opening) | 4.92 ± 0.69 (4.62 to 5.22 ) | 5.08 ± 0.64 (4.8 to 5.36) | 5.38 ± 1.16 (4.87 to 5.89) | 0.16 ± 0.43 (− 0.03 to 0.35) | 0.107 | 0.46 ± 0.78 (0.12 to 0.80) | 0.006* |
Lateral pterygoid (maximal opening) | 14.07 ± 0.84 (13.7 to 14.44) | 14.00 ± 1.08 (13.53 to 14.47) | 14.37 ± 1.10 (13.89 to 14.85) | − 0.43 ± 0.53 (− 0.66 to − 0.20) | 0.705 | 0.30 ± 0.30 (0.00 to 0.60) | 0.070 |
