Table 1

 Clinical characteristics of the study group (n  =  102)

Continuous data are presented as mean (SD).
*Index event categories are not mutually exclusive.
ACE, angiotensin converting enzyme; AMI, acute myocardial infarction; CABG, coronary artery bypass grafting; HF, high frequency power; HRT, hormone replacement therapy; LF, low frequency power; PTCA, percutaneous transluminal coronary angioplasty; SDNNI, mean of standard deviations of all normal to normal intervals for all five minute segments of the entire recording; VLF, very low frequency power.
Mean alcohol consumption (g/day)1.62 (2.57)
Mean consumption of
    Beer (g/day)0.61 (1.19)
    Wine (g/day)0.53 (1.16)
    Spirits (g/day)0.48 (1.11)
Heart rate variability
    ln SDNNI3.81 (0.52)
    ln total power7.14 (1.16)
    ln VLF power6.36 (1.06)
    ln LF power5.85 (1.23)
    ln HF power5.62 (1.35)
Mean RR (ms)897 (130)
Age (years)64.3 (8.1)
Body mass index (kg/m2)26.5 (4.3)
Smoking
    Current7.8%
    Former48.0%
    Never44.1%
Diabetes mellitus20.6%
Menopausal status
    Premenopausal8.9%
    Postmenopausal on HRT17.8%
    Postmenopausal without HRT73.3%
Educational attainment
    Mandatory68.6%
    High school17.6%
    College or university13.7%
Medication use
    Aspirin90.2%
    Calcium channel blocker24.5%
    β Blocker78.4%
    ACE inhibitor26.5%
    Statin77.5%
Index event*
    AMI45.1%
    CABG38.2%
    PTCA36.3%
Stress management53.9%