Table 1 Characteristics of the Cohort
From: RR Interval Variability Is Inversely Related to Inflammatory Markers: The CARDIA Study
Subjects with RRV data | |||
|---|---|---|---|
Characteristics | N | Mean or % | SD |
Calculated age at year 15 | 757 | 40.0 | 3.7 |
Sex, % of femalea | 757 | 57.6 | |
Ethnicity, % of Caucasian | 757 | 44.4 | |
Sex/ethnicity breakdown | |||
% of male, Caucasian | 156 | 20.6 | |
% of male, African American | 165 | 21.8 | |
% of female, Caucasian | 180 | 23.8 | |
% of female, African American | 256 | 33.8 | |
SES | |||
Education, years | 757 | 14.9 | 2.5 |
≤ HS | 164 | 21.7 | |
> HS to college | 448 | 59.2 | |
Post-college | 145 | 19.2 | |
Annual Income in $ | 746 | ||
< $42.5K | 152 | 20.4 | |
$42.5K to < $87.5K | 279 | 37.4 | |
$87.5K | 315 | 42.2 | |
BMI (kg/m2) | 754 | 29.3 | 7.3 |
Diastolic blood pressure (mmHg) | 757 | 75.5 | 10.6 |
Systolic blood pressure (mmHg) | 757 | 114.1 | 14.1 |
RR Interval Variability | |||
Heart Rate (HR) (bpm) | 757 | 72.6 | 11.6 |
Low Frequency (LF) (msec2) | 757 | 826.7 | 1106.7 |
High Frequency (HF) (msec2) | 757 | 771.7 | 1272.9 |
SDRR (msec) | 757 | 46.3 | 21.8 |
Diabetes mellitus | 45 | 6.0 | |
Hypertension | 133 | 17.6 | |
Smoking status | 756 | ||
Non-smoker | 486 | 64.3 | |
Ex-smoker | 128 | 16.9 | |
Current smoker | 142 | 18.8 | |