Histogram

Visit Number vs REM power density at 8.5 Hertz
N Mean StdDev Median Min Max Unknown Total
Baseline 3,222 12.6 ± 60.4 5.4 0.007 1,231.9 - 3,222
Follow-up 2,719 42.0 ± 111.2 4.7 0.006 1,015.7 - 2,719