TY - JOUR
T1 - Intra- and inter-rater reliability of digital image analysis for skin color measurement
AU - Sommers, Marilyn
AU - Beacham, Barbara
AU - Baker, Rachel
AU - Fargo, Jamison
PY - 2013/11
Y1 - 2013/11
N2 - Background: We determined the intra- and inter-rater reliability of data from digital image color analysis between an expert and novice analyst. Methods: Following training, the expert and novice independently analyzed 210 randomly ordered images. Both analysts used Adobe® Photoshop lasso or color sampler tools based on the type of image file. After color correction with Pictocolor® in camera software, they recorded L*a*b* (L*=light/dark; a*=red/green; b*=yellow/blue) color values for all skin sites. We computed intra-rater and inter-rater agreement within anatomical region, color value (L*, a*, b*), and technique (lasso, color sampler) using a series of one-way intra-class correlation coefficients (ICCs). Results: Results of ICCs for intra-rater agreement showed high levels of internal consistency reliability within each rater for the lasso technique (ICC ≥ 0.99) and somewhat lower, yet acceptable, level of agreement for the color sampler technique (ICC = 0.91 for expert, ICC = 0.81 for novice). Skin L*, skin b*, and labia L* values reached the highest level of agreement (ICC ≥ 0.92) and skin a*, labia b*, and vaginal wall b* were the lowest (ICC ≥ 0.64). Conclusion: Data from novice analysts can achieve high levels of agreement with data from expert analysts with training and the use of a detailed, standard protocol.
AB - Background: We determined the intra- and inter-rater reliability of data from digital image color analysis between an expert and novice analyst. Methods: Following training, the expert and novice independently analyzed 210 randomly ordered images. Both analysts used Adobe® Photoshop lasso or color sampler tools based on the type of image file. After color correction with Pictocolor® in camera software, they recorded L*a*b* (L*=light/dark; a*=red/green; b*=yellow/blue) color values for all skin sites. We computed intra-rater and inter-rater agreement within anatomical region, color value (L*, a*, b*), and technique (lasso, color sampler) using a series of one-way intra-class correlation coefficients (ICCs). Results: Results of ICCs for intra-rater agreement showed high levels of internal consistency reliability within each rater for the lasso technique (ICC ≥ 0.99) and somewhat lower, yet acceptable, level of agreement for the color sampler technique (ICC = 0.91 for expert, ICC = 0.81 for novice). Skin L*, skin b*, and labia L* values reached the highest level of agreement (ICC ≥ 0.92) and skin a*, labia b*, and vaginal wall b* were the lowest (ICC ≥ 0.64). Conclusion: Data from novice analysts can achieve high levels of agreement with data from expert analysts with training and the use of a detailed, standard protocol.
KW - Digital image analysis
KW - Image analysis
KW - Inter-rater reliability
KW - Protocols
KW - Skin color
KW - Skin imaging
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U2 - 10.1111/srt.12072
DO - 10.1111/srt.12072
M3 - Article
C2 - 23551208
AN - SCOPUS:84885472533
SN - 0909-752X
VL - 19
SP - 484
EP - 491
JO - Skin Research and Technology
JF - Skin Research and Technology
IS - 4
ER -