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. 2015 Jul 14;9:242. doi: 10.3389/fnins.2015.00242

Table 4.

Estimated intercept and slope for the power analysis and sample size estimation for caudate and putamen in left and right hemisphere.

Method Side Structure Intercept [Vp = VROI/ICV (%)] Slope [Vp/Year]
MALF Left Putamen 0.2748 −0.0026
Caudate 0.1989 −0.0014
Right Putamen 0.2672 −0.0023
Caudate 0.1992 −0.0014
BRAINSCut Left Putamen 0.2894 −0.0038
Caudate 0.2123 −0.0029
Right Putamen 0.2767 −0.0031
Caudate 0.2204 −0.0041

The power and sample size analysis performed on data expressed as a percent of total intercranial volume along years offollow-up. Note that slope magnitude from BRAINSCut is larger than that estimated by MALF. These slopes and intercepts were utilized as population parameters in the sample size estimation with 80% power. (Vp, Percent volume of total ICV; VROI, Volume of region of interest; ICV, intercranial volume).

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