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Table 1. 
Descriptive Statistics of Selected WM Performance Measures
MeasureMeanSEMRange
Count-span accuracy (%) 59.64 4.19 5.56–94.44 
In-scanner WM accuracy (%) 87.66 1.56 68.43–100 
In-scanner WM RT (sec) 1.52 0.05 1.11–2.19 
n-back accuracy (%) 95.66 0.53 88.88–100 
n-back 1-RT (sec) 0.66 0.032 0.33–1.11 
Prescan WM capacity (K items) 5.32 1.12 3–7 
MeasureMeanSEMRange
Count-span accuracy (%) 59.64 4.19 5.56–94.44 
In-scanner WM accuracy (%) 87.66 1.56 68.43–100 
In-scanner WM RT (sec) 1.52 0.05 1.11–2.19 
n-back accuracy (%) 95.66 0.53 88.88–100 
n-back 1-RT (sec) 0.66 0.032 0.33–1.11 
Prescan WM capacity (K items) 5.32 1.12 3–7 

Six WM measures selected for latent variable (WML) analyses and their means, 1 SEM, and ranges.

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