Table 7.
Comparison of tongue image indexes in different pathological stages [mean (SD), median (IQR)]
| Domain | Color space | Index | Phase I 137 | Stage II III 55 | Stage IV 117 | |||
|---|---|---|---|---|---|---|---|---|
| Tongue | L*a*b | TB-L | 75.48 | (3.95) | 75.29 | (3.1) | 74.74 | (3.86) |
| body | TB-a | 17.21 | (3.04) | 16.95 | (2.75) | 18.45 | (3.34)∗# | |
| TB-b | 5.88 | (2) | 6.17 | (2.17) | 5.03 | (2.08)∗ | ||
| Texture index | TB-CON | 81.53 | (58.65–108.53) | 80.84 | (58–105.66) | 72.61 | (57.06–100.71) | |
| TB-ENT | 1.24 | (0.11) | 1.23 | (0.11) | 1.22 | (0.11) | ||
| TB-ASM | 0.07 | (0.06–0.09) | 0.07 | (0.06–0.09) | 0.08 | (0.06–0.09) | ||
| TB-MEAN | 0.03 | (0.01) | 0.03 | (0.01) | 0.03 | (0.01) | ||
| Tongue | L*a*b | TC-L | 79.24 | (76.15–81.91) | 78.62 | (75.88–81.64) | 78.43 | (74.74–80.64) |
| coating | TC-a | 10.16 | (8.47–12.72) | 9.81 | (8.16–12.6) | 10.62 | (8.78–12.73) | |
| TC-b | 4.02 | (2.18) | 4.12 | (1.99) | 3.64 | (2.76) | ||
| Tongue coating | perAll | 0.54 | (0.42–0.71) | 0.52 | (0.45–0.74) | 0.5 | (0.41–0.64) | |
| index | perPart | 1.1 | (1.04–1.27) | 1.12 | (1.03–1.36) | 1.12 | (1.04–1.37) | |
| Texture index | TC-CON | 111.92 | (82.71–149.38) | 120.44 | (90.91–155.21) | 102.62 | (75.39–137.96) | |
| TC-ENT | 1.32 | (1.25–1.38) | 1.33 | (1.27–1.39) | 1.3 | (1.23–1.37) | ||
| TC-ASM | 0.06 | (0.05–0.07) | 0.06 | (0.05–0.07) | 0.06 | (0.05–0.07) | ||
| TC-MEAN | 0.03 | (0.03–0.04) | 0.03 | (0.03–0.04) | 0.03 | (0.03–0.04) | ||
Note: * significantly different from stage I; # significantly different from stage II III. The -test or Mann-Whitney U test was used. 0.05, the difference was statistically significant.