Table 4.
Results of Kruskal Wallis H-test (χ2, p-value) for investigating whether the mean gist response differs as a function of breast density, lesion type, lesion position, lesion size, and lesion distance to the center point.
| (χ2, p-value) | Density | Type | Position | Low/High density* | Mass/others** | Lesion size¤ | Distance§ |
|---|---|---|---|---|---|---|---|
| Cancer | 4.46, 0.11 | 6.08, 0.30 | 7.99, 0.05 | 1.45, 0.23 | 0.59, 0.44 | 0.54, 0.46 | 0.03, 0.86 |
| Prior_Vis | 4.82, 0.19 | 4.25, 0.51 | 0.59, 0.90 | 0.89, 0.34 | 0.04, 0.84 | 3.22, 0.07 | 0.49, 0.49 |
| Contra | 0.89, 0.64 | 5.82, 0.32 | 2.61, 0.46 | 0.89, 0.34 | 1.34, 0.25 | 0.00, 0.95 | 0.38, 0.54 |
| Prior_Invis | 0.63, 0.89 | 7.93, 0.16 | 1.08, 0.78 | 0.22, 0.64 | 0.06, 0.81 | 0.47, 0.49 | 1.83, 0.18 |
| All abnormal | 1.88, 0.60 | 1.66, 0.89 | 1.68, 0.64 | 0.18, 0.67 | 0.00, 0.97 | 0.10, 0.75 | 3.09, 0.08 |
*The low density group contained BIRADS I and II while the high density one comprised on BIRADS III and IV.
**Calcification and architectural distortion were grouped as “others”.
¤Lesions were divided into two groups, those larger than 10 mm2 (the median value) and those smaller than that.
§Lesions were divided into two groups, those further than 1343 pixels (the median value) and those nearer than that.
The significant p-value is shown in bold. However these p-values are not corrected for multiple comparisons.