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. Author manuscript; available in PMC: 2016 Nov 3.
Published in final edited form as: J Clin Densitom. 2014 Jul 1;18(1):93–101. doi: 10.1016/j.jocd.2014.04.124

Table 2.

Precision Error for Test-Retest Imaging Compared Between Methods

Reliability data
RMSSD (units)
RMSCV (% error)
Variable and method Young Older SCI Young Older SCI
Watershed MD (mg/cm3) 0.89 1.43 0.85 1.18 2.01 1.42
Threshold-based MD (mg/cm3) 1.73 1.22 2.43 2.36 1.77 4.06
Watershed MCSA (mm2) 34.96 53.97 52.34 0.49 0.93 1.38
Threshold-based MCSA (mm2) 154.35 105.37 142.10 2.57 1.77 2.94

Note: Comparing reliability of peripheral quantitative computed tomography muscle measures obtained by watershed vs threshold-based edge detection segmentation separated by participant subgroups.

Abbr: MCSA, muscle cross-sectional area; MD, muscle density; RMSCV, root mean square coefficients of variation; RMSSD, root mean square standard deviation; SCI, spinal cord injury.