Table 1.
Descriptive statistics of demographic, health and environmental factors among visits of the Normative Aging Study participants with heart rate variation measures between November 2000 and December 2007 in Boston, Massachusetts, USA
| Variable | First visit (n=583) ¶ | Total visits (n=839) ¶¶ |
|---|---|---|
| Age, years * | 72.98 (6.60) | 73.77 (6.61) |
| Body mass index, kg/m2 | 28.16 (4.01) | 28.07 (4.06) |
| Mean arterial pressure, mmHg | 93.16 (10.74) | 91.45 (10.84) |
| Fasting blood glucose, mg/dl | 107.51 (27.25) | 107.40 (25.16) |
| Season, n (%) | ||
| Spring | 153 (26.24) | 204 (24.31) |
| Summer | 139 (23.84) | 205 (24.43) |
| Fall | 166 (28.47) | 254 (30.27) |
| Winter | 125 (21.44) | 176 (20.98) |
| Smoking status, n (%) | ||
| Never smoker | 173 (29.67) | 259 (30.87) |
| Current smoker | 25 (4.29) | 27 (3.22) |
| Former smoker | 385 (66.04) | 553 (65.91) |
| Alcohol intake (≥ 2 drinks/day), n (%) | 107 (18.35) | 154 (18.36) |
| Use of β-blocker, n (%) | 209 (35.85) | 320 (38.14) |
| Use of Ca-Channel blocker, n (%) | 79 (13.55) | 121 (14.42) |
| Use of angiotensin-converting enzyme inhibitor, n (%) | 128 (21.96) | 200 (23.84) |
| Log10 standard devision of normal-to-normal intervals, msec | 1.53 (0.28) | 1.52 (0.29) |
| Log10 high frequency, msec2 | 2.02 (0.59) | 1.94 (0.75) |
| Log10 low frequency, msec2 | 1.95 (0.73) | 2.00 (0.60) |
| PM2.5, µg/m3 ** | 11.32 (6.53) | 11.80 (6.18) |
| apparent temperature, °C ** | 10.68 (9.75) | 10.38 (9.71) |
| Room temperature, °C | 24.24 (1.80) | 23.96 (1.69) |
| Cholesterol, mg/dL | 270.62 (145.06) | 259.65 (139.59) |
¶
for the first time visits of participants;
¶¶
for the total visits of participants;
*
Values are mean± SD when appropriate.
**
Two day moving averages.