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Table 2 Color and geometrical variables of melanoma patients, as extracted with digital image processing

From: Computer-aided clinical image analysis for non-invasive assessment of tumor thickness in cutaneous melanoma

Variable Mean (SD) r coefficient p value
Geometric variables
 Area (cm2) 2.5 (3.7) 0.72 0.000
 MaxD (cm) 1.9 (1) 0.65 0.000
 Perimeter (cm) 5.5 (2.9) 0.62 0.000
 Circularity (ratio) 1.1 (0.07) − 0.05 0.56
 Rm (cm) 0.8 (0.4) 0.65 0.000
 Eccentricity (cm) 0.03 (0.02) 0.46 0.000
Color variables
 Mean red 156 (32) − 0.17 0.04
 SD red 33 (11) 0.11 0.19
 CV red 23 (11) 0.14 0.09
 Range red 191 (35) 0.15 0.06
 Skewness red − 0. 3 (0.7) 0.16 0.05
 Mean green 97 (24) − 0.17 0.03
 SD green 30 (6) 0.28 0.000
 CV green 33 (12) 0.33 0.000
 Range green 194 (32) 0.23 0.003
 Skewness green 0.43 (0.57) 0.18 0.03
 Mean blue 93 (25) − 0.04 0.64
 SD blue 30 (6) 0.21 0.01
 CV blue 35 (12) 0.18 0.02
 Range blue 202 (33) 0.21 0.009
 Skewness blue 0.47 (0.54) 0.08 0.31
  1. All continuous variables are approximately normally distributed and therefore expressed in mean-deviation form. Statistical significance: p-value < 0.05