Histogram

Sleep Heart Health Study (SHHS) Visit Number vs Standard deviation of all normal sinus to normal sinus interbeat (NN) intervals
N Mean StdDev Median Min Max Unknown Total
Visit 1 42,920 54.0 ± 32.2 46.0 4.6 329.7 - 42,920
Interim Follow-up Visit - - - - - - - -
Visit 2 44,578 52.5 ± 32.2 44.5 2.9 340.8 - 44,578
CVD Outcomes - - - - - - - -