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The uniformity and reproducibility of the light distribution on facial skin. Related parameters are mean (μ), standard deviation (σ), and coefficient of variance [CV(%)=(σ/μ) × 100].
| White light source | UV-A source | |||
|---|---|---|---|---|
| Patch No. (1—21) |
T-zone (Patch No. 1–8) |
U-zone (Patch No. 9—21) |
T-zone (Patch No. 1—8) |
U-zone (Patch No. 9—21) |
| μ | 226.41±2.41 | 201.18±1.65 | 210.63±6.65 | 200.32±4.33 |
| σ | 11.92 | 15.36 | 9.93 | 11.81 |
| CV (%) | 5.26 | 7.63 | 4.70 | 5.89 |
