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. 2024 May 10;32(3):1403–1420. doi: 10.3233/THC-230372

Table 7.

Comparison of tongue image indexes in different pathological stages [mean (SD), median (IQR)]

Domain Color space Index Phase I N= 137 Stage II + III N= 55 Stage IV N= 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 t-test or Mann-Whitney U test was used. P< 0.05, the difference was statistically significant.