Table 2.
Comparison of single-slice and whole-lesion histogram parameters of PM and NM in the training and validation datasets.
| Parameters | Training dataset | Validation dataset | ||||
|---|---|---|---|---|---|---|
| NM | PM | p | NM | PM | p | |
| S-ASD | −2.976 ± 15.859 | −2.902 ± 8.077 | 0.973 | −2.312 ± 9.593 | 0.490 ± 6.293 | 0.181 |
| S-STD | 161.602 ± 101.977 | 135.420 ± 60.213 | 0.076 | 129.270 ± 68.500 | 130.685 ± 59.258 | 0.932 |
| S-Average ratio | 0.428 ± 0.685 | 1.345 ± 1.414 | <0.001* | 0.523 ± 0.888 | 0.993 ± 0.887 | 0.045* |
| S-Mean | −58.878 ± 340.285 | −15.669 ± 330.362 | 0.456 | −73.787 ± 164.636 | −37.878 ± 88.316 | 0.289 |
| S-Skewness | 0.088 ± 1.089 | −0.854 ± 0.816 | <0.001* | 0.231 ± 1.035 | −0.871 ± 0.995 | <0.001* |
| S-Kurtosis | 0.987 ± 4.616 | 1.163 ± 3.397 | 0.802 | 1.364 ± 3.860 | 1.727 ± 5.520 | 0.772 |
| S-Area | 0.775 ± 0.357 | 1.236 ± 0.416 | <0.001* | 0.795 ± 0.419 | 1.128 ± 0.373 | 0.002* |
| S-Volume | 0.428 ± 0.685 | 1.345 ± 1.414 | <0.001* | 0.523 ± 0.888 | 0.993 ± 0.887 | 0.045* |
| S-Median | −50.810 ± 344.826 | −73.250 ± 146.112 | <0.001* | −299.820 ± 296.139 | −29.190 ± 114.492 | <0.001* |
| S-Maximum | 190.590 ± 450.767 | 156.170 ± 176.689 | 0.57 | 123.320 ± 600.592 | 197.130 ± 112.848 | 0.498 |
| S-Minimum | −58.970 ± 233.980 | −69.970 ± 252.732 | 0.035* | −623.040 ± 210.656 | −532.810 ± 289.115 | 0.178 |
| W-ASD | 364.124 ± 909.629 | 218.649 ± 176.266 | 0.214 | 211.019 ± 314.358 | 204.203 ± 179.826 | 0.917 |
| W-STD | 161.978 ± 101.572 | 135.300 ± 60.134 | 0.07 | 128.909 ± 68.194 | 130.383 ± 59.421 | 0.929 |
| W-Average ratio | 0.960 ± 0.466 | 1.610 ± 0.522 | <0.001* | 0.960 ± 0.404 | 1.485 ± 0.450 | <0.001* |
| W-Mean | −39.095 ± 326.163 | −99.504 ± 129.099 | 0.002* | −292.437 ± 290.740 | −56.853 ± 106.652 | <0.001* |
| W-Skewness | 0.064 ± 1.016 | −0.851 ± 0.824 | <0.001* | 0.245 ± 1.041 | −0.859 ± 1.008 | <0.001* |
| W-Kurtosis | 3.723 ± 4.279 | 4.185 ± 3.455 | 0.494 | 4.373 ± 3.957 | 4.713 ± 5.622 | 0.791 |
| W-Area | 86.586 ± 145.308 | 206.406 ± 221.798 | <0.001* | 93.797 ± 112.534 | 167.841 ± 189.459 | 0.076 |
| W-Volume | 134.501 ± 340.853 | 394.708 ± 510.214 | 0.001* | 122.925 ± 184.577 | 301.584 ± 380.789 | 0.028* |
| W-Median | −42.164 ± 337.581 | −73.365 ± 146.188 | <0.001* | −299.839 ± 295.991 | −29.359 ± 114.730 | <0.001* |
| W-Maximum | 188.810 ± 450.066 | 156.140 ± 176.460 | 0.589 | 138.640 ± 586.255 | 195.940 ± 110.947 | 0.59 |
| W-Minimum | −18.330 ± 250.784 | −57.700 ± 263.027 | 0.172 | −613.680 ± 225.487 | −505.530 ± 311.857 | 0.134 |
ASD, Average standard deviation ratio; STD, Standard deviation.
S-, single-slice histogram parameters; W-, whole-lesion histogram parameters. A two-sample t-test was used to compare the differences of those parameters.
*
p < 0.05.