Table 3.
Statistical result of the tongue body and tongue coating (mean (SD) and median (P25, P75)).
| Domain | Color space | Index | Healthy controls | Subhealth fatigue | Disease fatigue |
|---|---|---|---|---|---|
| (N = 551) | (N = 252) | (N = 1160) | |||
| TB | RGB | TB-R | 156.00(143.00,171.00) | 153.00(139.00,165.75) | 158.00(147.00,169.00)## |
| TB-G | 99.00(90.00,110.00) | 98.00(87.00,110.00) | 100.00(92.00,110.75)# | ||
| TB-B | 105.00(94.00,118.00) | 104.00(93.00,118.00) | 108.00(99.00,120.00) ∗∗## | ||
| YCrCb | TB-Y | 115.77(107.05,126.27) | 115.40(105.14,125.09) | 117.46(110.08,126.16)## | |
| TB-Cr | 152.17(149.64,154.65) | 151.31(148.37,153.84) ∗∗ | 152.21(148.82,155.17)# | ||
| TB-Cb | 121.46(119.99,124.21) | 121.32(119.84,126.08) | 121.74(120.00,127.46) ∗ | ||
| HSI | TB-H | 176.27(169.98,179.15) | 176.52(166.25,180.00) | 175.16(162.12,178.32) ∗∗## | |
| TB-S | 0.18(0.16,0.20) | 0.18(0.15,0.20) | 0.18(0.16,0.20) | ||
| TB-I | 119.00(108.00,132.00) | 118.50(106.00,130.00) | 121.00(113.00,132.00) ∗## | ||
| Lab | TB-L | 104.33(100.72,108.58) | 104.08(99.70,108.05) | 104.94(101.84,108.42)## | |
| TB-a | 20.62(18.42,22.79) | 20.49(18.11,22.68) | 20.98(18.69,23.13) | ||
| TB-b | 4.91(1.64,6.59) | 5.01(−0.17,6.87) | 4.35(−1.82,6.23) ∗∗# | ||
| Texture index | TB-CON | 65.33(42.36,92.43) | 66.07(40.86,97.57) | 60.92(41.26,85.49) | |
| TB-ENT | 1.19(1.09,1.27) | 1.19(1.08,1.28) | 1.17(1.08,1.26) | ||
| TB-ASM | 0.08(0.07,0.10) | 0.08(0.07,0.10) | 0.08(0.07,0.10) ∗ | ||
| TB-MEAN | 0.02(0.02,0.03) | 0.02(0.02,0.03) | 0.02(0.02,0.03) ∗ | ||
|
| |||||
| TC | RGB | TC-R | 152.00(17.65) | 149.56(17.84) | 152.44(16.62) |
| TC-G | 115.00(103.00,126.00) | 114.50(103.00,127.00) | 114.00(104.00,126.00) | ||
| TC-B | 120.00(106.00,134.00) | 118.00(105.25,135.00) | 121.00(109.00,138.00)∗ | ||
| YCrCb | TC-Y | 124.63(115.36,134.38) | 123.65(113.84,134.00) | 124.44(116.39,134.07) | |
| TC-Cr | 143.88(141.46,146.59) | 143.15(140.51,145.71)∗ | 143.95(140.29,147.04) | ||
| TC-Cb | 123.25(121.65,126.17) | 123.25(121.64,128.76) | 123.76(121.83,129.82)∗∗ | ||
| HSI | TC-H | 177.27(167.16,181.53) | 177.39(156.48,182.40) | 175.23(151.57,180.00)∗∗## | |
| TC-S | 0.12(0.10,0.14) | 0.12(0.09,0.14) | 0.12(0.10,0.14) | ||
| TC-I | 129.00(117.00,140.00) | 128.00(115.00,140.00) | 129.00(119.00,140.00) | ||
| Lab | TC-L | 108.41(104.62,112.06) | 108.11(104.12,112.09) | 108.28(105.06,112.02) | |
| TC-a | 13.10(2.78) | 12.71(2.78) | 13.27(2.75) | ||
| TC-b | 3.17(0.03,4.86) | 3.22(-1.97,4.95) | 2.63(−3.34,4.68) ∗ | ||
| Area index | perAll | 0.50(0.41,0.67) | 0.53(0.41,0.76) | 0.49(0.38,0.79) | |
| perPart | 1.11(1.04,1.25) | 1.08(1.03,1.22) | 1.10(1.02,1.21) | ||
| Texture index | TC-CON | 82.23(57.65,115.59) | 88.97(58.76,125.73) | 82.58(56.88,114.81) | |
| TC-ENT | 1.25(1.16,1.32) | 1.27(1.17,1.34) | 1.25(1.16,1.33) | ||
| TC-ASM | 0.07(0.06,0.08) | 0.07(0.06,0.08) | 0.07(0.06,0.09) | ||
| TC-MEAN | 0.03(0.02,0.03) | 0.03(0.02,0.03) | 0.03(0.02,0.03) | ||
Vs. healthy controls, ∗P < 0.05, vs. healthy controls, ∗∗P < 0.01, vs. subhealth fatigue, #P < 0.05, vs. subhealth fatigue group, ##P < 0.01.