TABLE 2B.
Comparison of biophysical parameters of the scalp, according to age group (men, N = 40).
| Vertex region | Occipital region | Temporal region | ||||
|---|---|---|---|---|---|---|
| Scalp index | 20s (N = 20) | 50s (N = 20) | 20s (N = 20) | 50s (N = 20) | 20s (N = 20) | 50s (N = 20) |
| Elasticity (Alpha) | 0.055 ± 0.013 | 0.050 ± 0.010 | 0.058 ± 0.014 | 0.062 ± 0.011 | 0.070 ± 0.020 | 0.060 ± 0.010 |
| p‐Value | 0.39 | 0.45 | 0.09 | |||
| Firmness (mm) | 1.00 ± 0.26 | 1.07 ± 0.29 | 1.27 ± 0.26 | 1.34 ± 0.35 | 1.14 ± 0.30 | 1.22 ± 0.31 |
| p ‐Value | 0.40 | 0.48 | 0.23 | |||
| pH | 4.95 ± 0.49 | 4.88 ± 0.59 | 4.42 ± 4.45 | 4.61 ± 0.70 | 4.48 ± 0.44 | 4.64 ± 0.47 |
| p ‐Value | 0.73 | 0.32 | 0.25 | |||
| TEWL (g/m2h) | 25.7 ± 6.53 | 26.3 ± 7.65 | 34.5 ± 10.5 | 31.7 ± 21.3 | 32.7 ± 8.61 | 32.0 ± 13.37 |
| p ‐Value | 0.49 | 0.025 # | 0.25 | |||
| Sebum (μg/cm2) | 68.3 ± 51.0 | 79.1 ± 54.1 | 72.4 ± 78.9 | 62.9 ± 26.1 | 69.4 ± 57.1 | 61.2 ± 54.8 |
| p ‐Value | 0.39 | 0.36 | 0.71 | |||
| Skin desquamation (%) | 6.95 ± 2.46 | 6.32 ± 2.20 | 6.33 ± 2.60 | 5.13 ± 1.78 | 6.50 ± 2.82 | 5.79 ± 1.77 |
| p ‐Value | 0.47 | 0.19 | 0.29 | |||
| Redness (R, AU) | 140.4 ± 18.8 | 152.3 ± 24.3 | 133.9 ± 16.9 | 145.3 ± 19.0 | 138.6 ± 18.1 | 137.2 ± 15.7 |
| p ‐Value | 0.12 | 0.07 | 0.99 | |||
| Yellowness (Y, AU) | 42.2 ± 2.90 | 47.7 ± 5.17 | 40.7 ± 2.07 | 47.0 ± 6.66 | 41.7 ± 2.58 | 45.3 ± 4.51 |
| p ‐Value | 0.001 ## | <0.001 ### | <0.005 ### | |||
*
p‐Value < 0.05 independent t‐test.
**
p‐Value < 0.01 independent t‐test.
***
p‐Value < 0.001 independent t‐test.
#
p‐Value < 0.05 Mann–Whitney U test.
##
p‐Value < 0.01 Mann–Whitney U test.
###
p‐Value < 0.001 Mann–Whitney U test.
Abbreviations: AU, artificial unit; TEWL, transepidermal water loss.