Table 2.
Means and standard deviations of biophysical measurements and the difference between the age groups (ANOVA) for the right and left cheeks.
|
Young group (n = 8) |
Midaged group (n = 8) |
Old group (n = 8) |
ANOVA P value |
|||||
|---|---|---|---|---|---|---|---|---|
| Right | Left | Right | Left | Right | Left | Right | Left | |
| Skin barrier | ||||||||
| TEWL | 12.9 (3.6) | 14.2 (3.5) | 8.9 (1.8) | 9.0 (2.0) | 9.8 (2.7) | 9.8 (2.4) | 0.023 | 0.002 |
| SCH | 41.3 (11.1) | 45.6 (12.1) | 47.4 (9.4) | 46.0 (10.7) | 42.2 (10.7) | 42.1 (12.0) | 0.463 | 0.760 |
| pH | 4.9 (0.6) | 4.5 (0.7) | 5.2 (0.5) | 4.9 (0.6) | 4.8 (0.4) | 4.8 (0.3) | 0.236 | 0.323 |
| Skin colour | ||||||||
| L * | 65.8 (1.4) | 65.2 (1.8) | 64.6 (2.4) | 64.9 (1.8) | 62.2 (3.3) | 62.9 (2.0) | 0.028 | 0.042 |
| b * | 15.8 (1.3) | 15.9 (1.3) | 17.7 (2.1) | 17.8 (1.9) | 16.3 (1.8) | 17.0 (2.1) | 0.101 | 0.118 |
| Skin roughness | ||||||||
| R z | 47.5 (7.3) | 47.4 (5.6) | 48.9 (5.4) | 49.6 (9.5) | 54.6 (8.8) | 54.3 (6.1) | 0.140 | 0.175 |
| R max | 63.4 (9.4) | 63.7 (7.0) | 64.4 (7.9) | 67.3 (12.4) | 73.7 (10.5) | 73.3 (7.8) | 0.076 | 0.141 |
| Skin elasticity | ||||||||
| U f | 0.21 (0.04) | 0.21 (0.04) | 0.26 (0.09) | 0.25 (0.08) | 0.31 (0.09) | 0.29 (0.07) | 0.071 | 0.074 |
| U f − U a | 0.06 (0.01) | 0.07 (0.02) | 0.1 (0.04) | 0.08 (0.03) | 0.13 (0.06) | 0.11 (0.04) | 0.011 | 0.035 |
| U r/U f | 0.29 (0.02) | 0.28 (0.04) | 0.24 (0.04) | 0.26 (0.03) | 0.22 (0.09) | 0.25 (0.05) | 0.082 | 0.246 |
| F 0 | 0.04 (0.01) | 0.04 (0.01) | 0.05 (0.01) | 0.05 (0.01) | 0.06 (0.01) | 0.06 (0.01) | 0.004 | 0.011 |
TEWL: transepidermal water loss (g/m²/h); SCH: stratum corneum hydration (arbitrary units); L *: luminance; b *: yellowness; R z: mean depth of roughness (µm); R max: maximal roughness (µm); U f: structural extensibility (mm); U f − U a: residual skin deformation (mm); U r/U f: elastic recovery (ratio); F 0: immediate elasticity (area).