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. Author manuscript; available in PMC: 2010 May 10.
Published in final edited form as: Psychophysiology. 2008 Sep 24;45(6):1046–1054. doi: 10.1111/j.1469-8986.2008.00698.x

Table 1.

Participant Demographics

Characteristic Mean SD
Age (years) 67.98 1.38
Number of years of school completed 15.43 1.59
Number of alcoholic beverages
consumed/week		 2.37 3.69
Number of days smoked at least
one cigarette		 0.28 1.39
Height (in.) 63.38 3.02
Weight (lbs.) 154.34 22.09
Body mass index (kg/m2) 27.09 4.17
Basal SDNN 34.98 35.6
Basal MSD 26.99 50.7
Basal total power (ms2) 76,282.74 168,758.5
Basal HF-HRV (ln ms2) 4.42 1.3

Note: SDNN: standard deviation of normal-to-normal interbeat intervals; MSD: mean square successive differences; HF-HRV: high-frequency heart rate variability. The natural log of basal HF-HRV is reported; the original mean is 83.10.