Comparison of head acceleration events between iMG and CG frames of reference for each direction of head motion
| Head impact location | HAE count | PAA (rad/s2) | PLAiMG (g) | PLACG (g) | Agreement | RMSD (g) | NRMS (%) | ||||||
| Median | IQR | Median | IQR | Median | IQR | LCCC | 95% CI | Median | Range | Median | Range | ||
| Top | N=183 | 1284.89 | (1084.01) | 16.3 | (12.27) | 19.07 | (12.95) | 0.71 | (0.64 to 0.77) | 2.50 | (14.40) | 13.78 | (36.29) |
| Front High | N=180 | 1214.56 | (1004.81) | 16.61 | (8.99) | 16.73 | (9.42) | 0.73 | (0.66 to 0.76) | 2.19 | (12.87) | 12.89 | (44.19) |
| Front Low | N=72 | 1092.28 | (1166.76) | 21.38 | (20.07) | 15.36 | (10.47) | 0.78 | (0.70 to 0.85) | 2.01 | (28.33) | 12.65 | (29.22) |
| Back High | N=148 | 1119.39 | (855.99) | 15.42 | (9.93) | 15.22 | (11.42) | 0.88 | (0.84 to 0.91) | 2.48 | (16.09) | 13.73 | (45.16) |
| Back Low | N=38 | 1407.36 | (902.01) | 11.31 | (9.37) | 15.22 | (11.42) | 0.51 | (0.27 to 0.67) | 1.87 | (8.55) | 10.06 | (26.96) |
| Left High | N=55 | 1190.03 | (1041.57) | 13.36 | (7.11) | 15.41 | (11.32) | 0.49 | (0.29 to 0.66) | 2.20 | (16.49) | 13.81 | (41.28) |
| Left Low | N=38 | 1187.98 | (853.45) | 15.97 | (15.01) | 17.92 | (12.09) | 0.74 | (0.57 to 0.85) | 2.37 | (8.38) | 13.16 | (38.26) |
| Right High | N=85 | 1065.61 | (688.36) | 12.27 | (5.44) | 15.46 | (9.13) | 0.66 | (0.54 to 0.76) | 2.40 | (37.70) | 13.25 | (34.40) |
| Right Low | N=26 | 1180.15 | (831.94) | 17.39 | (11.68) | 16.77 | (6.99) | 0.60 | (0.33 to 0.78) | 2.19 | (6.27) | 12.55 | (50.80) |
| Total | N=825 | 1185.79 | (981.8) | 15.7 | (11.0) | 17.1 | (10.9) | 0.7 | (0.68 to 0.74) | 3.0 | (38.0) | 13.4 | (51.3) |
CG, center of gravity; HAE, head acceleration event; iMG, instrumented mouthguard; LCCC, Lin’s Concordance Correlation Coefficients; NRMS, RMS was normalised; PAA, peak angular acceleration; PLA, peak linear acceleration; RMSD, root mean square deviation.