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NSRR
SDNN - CHAT Variables
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Childhood Adenotonsillectomy Trial
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Variables
v0.14.0
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variables
Clinical Data
Diagnostic Studies
Heart Rate Variability
sdnn
sdnn
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sdann
sdnnidx
Name
sdnn
Label
Standard deviation of all normal sinus to normal sinus interbeat (NN) intervals
Units
seconds (s)
Type
numeric
Visit Number vs Standard deviation of all normal sinus to normal sinus interbeat (NN) intervals
N
Mean
StdDev
Median
Min
Max
Unknown
Total
Baseline
45,072
0.08
± 0.04
0.08
0.005
0.5
-
45,072
Follow-up
40,073
0.08
± 0.04
0.07
0.004
0.3
-
40,073