Table 1

 One way analysis of variance or χ2 for all clinical values testing for overall differences between groups at baseline

VariableSurvivors (n = 150)Cardiac deaths (n = 26)Non-cardiac deaths (n = 16)p Value
Data are mean (SD) or percentages.
ABPI, ankle brachial pressure index; ACE-I, angiotensin converting enzyme inhibitor; BP, blood pressure; HR, heart rate; QTcmax, maximum heart rate corrected QT interval; QTD, QT dispersion; RR interval, heart rate variation in response to deep breathing; RR ratio, heart rate variation in response to standing.
QTD (ms)73.6 (27.5)88.4 (33.4)68.8 (27.1)0.034
QTcmax (ms)487.9 (37.8)521.9 (49.7)484.4 (38.7)<0.001
Age (years)51.9 (8.6)57.1 (6.9)57.0 (9.4)0.003
Systolic BP (mm Hg)146.8 (20.8)158.5 (32.7)148.5 (30.2)0.063
Diastolic BP (mm Hg)91.5 (11.1)92.4 (13.8)88.5 (15.3)0.068
Pulse pressure (mm Hg)55.3 (15.7)66.0 (24.9)60.0 (22.2)0.583
ABPI1.08 (0.15)1.04 (0.21)1.12 (0.21)0.016
RR ratio1.26 (0.16)1.22 (0.18)1.24 (0.14)0.272
RR interval0.86 (0.14)0.83 (0.12)0.87 (0.13)0.579
Creatinine (mmol)77.9 (0.1)79.8 (18.7)80.5 (15.7)0.707
Potassium (mmol)4.3 (0.3)4.0 (0.4)4.1 (0.3)0.877
Sodium (mmol)138.7 (2.2)137.6 (3.0)139.2 (2.0)0.042
Glucose (mmol)12.2 (4.5)13.3 (4.0)13.1 (2.6)0.353
Resting HR (beats/min)79 (11)77 (13)76 (12)0.657
Cardiothoracic ratio43.3 (4.9)43.4 (3.3)42.6 (3.9)0.857
Family history45%46%60%0.526
Smoking37%50%33%0.560
β Blocker11%19%27%0.172
ACE-I0.7%0%6.7%0.081
Diuretic14%23%20%0.450
Calcium antagonist0.7%3.9%0%0.313
Men56%62%67%0.663