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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Skin Res Technol. 2012 Jan 11;19(1):e20–e26. doi: 10.1111/j.1600-0846.2011.00602.x

Table 1.

Descriptions for Dirt Trail Dermoscopic Features

Feature Description of features for objects within lesion Meaning p-val, Wald Chi-sq *
OBN Number of objects BCC have more dirt trails 0.3301* n.s.
AREA_AV Average area of objects BCC have clods in trails 0.4335 n.s.
MAX_EC Maximum eccentricity of objects: ratio of elliptical axes Dirt trail objects are longer 0.1902 n.s.
AVE_EC Average eccentricity of objects: ratio of elliptical axes Dirt trail objects are longer > 0.5 n.s. (feature not selected)
RED_AV Average red value of objects BCC trails are darker 0.0689 n.s.
GREEN_AV Average green value of objects BCC trails are darker 0.0108
BLUE_AV Average blue value of objects BCC trails are darker 0.0085
REL_BLUE Ratio of BLUE_AV to average blue surrounding object BCC surrounds are pink 0.2826 n.s.
GR/BLUE Ratio GREEN_AV/BLUE_AV BCC objects are greener (brighter) 0.1232 n.s.
*

p-values from SAS model for all variables in logistic regression model with p < 0.5, maximum likelihood estimate, Wald Chi-sq.