334 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS There was good correlation between the arithmetic average roughness (Ra) and the mean depth of roughness (Rz) with the subjective plumpness score. The relationship was valid for traces taken both normal to (Figure 7) and parallel with (Figure 8) the principal furrows. The directional dependence of Rz and Ra was similar in that the 16 -I- Y = 1.34X + 4.16 r = B.687 I I I i I ) I I •, I 3 4.5 6 7.5 9 SUBJECTIVE PLUMPNESS SCORE 10.5 16 (B) Y = 1.78X - 3.Bg r' = B.711 -I- -I- -I- -I- • I I I I I I I I I I I I : : : •.. B 1.S 3 4.5 6 7.5 9 IB.S 12 SUBJECT!VE PLUHPNESS SCORE Figure 7. Relationship between the subjective plumpness score and the Ra value of traces taken normal to (A) and parallel with (B) the major furrows of the skin. Correlation significant at p 0.02.

OBJECTIVE AND SUBJECTIVE SKIN SURFACE EVALUATION 335 20 lB 1.13X + 5.132 0.659 + 3 4.5 6 7.5 9 SUBJECTIVE PLUHPNE55 5CORE 10.5 16 (B) ¾ = 1.46X - 01.72 r = 01. 626 O! 1.5 3 4.5 6 7.5 9 101.5 12 SUBJECT!VE PLUHPNESS SCORE Figure 8. Relationship between the subjective plumpness score and the Rz value of traces taken normal to (A) and parallel with (B) the major furrows of the skin. Correlation significant at p 0.02. slopes of the lines were not significantly affected by the direction of the trace. The y- intercepts, however, were significantly (p = 0.0002) higher for traces taken perpen- dicularly to the principal furrows. This result is consistent with those of Cook et al. (12) who reported that several roughness parameters had a large dependence on the