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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: J Surg Res. 2014 Nov 6;199(2):688–697. doi: 10.1016/j.jss.2014.10.055

Table 2.

Original Scale: Correlation and Variance by Category.

Statistical Parameter Category
Surface Height Color Thickness
Cronbach’s Alpha 0.74 0.83 0.75 0.77
Intraclass Correlation1 (95% Confidence Interval) 0.32 (0.24 – 0.42) 0.47 (0.48 – 0.57) 0.36 (0.28 – 0.46) 0.39 (0.30 – 0.48)
Po 0.33 0.39 0.26 0.35
CV ± SEM 0.67 ± 0.94 0.45 ± 0.31 NC2 0.41 ± 0.21
Variance ± SEM 1.40 ± 1.28 0.63 ± 0.50 0.66 ± 0.44 1.37 ± 1.07
1

Based on standardized items.

2

NC: Resulted in error (mean = 0).