Table 1.
Baseline characteristics of the study population
| Men with no ST-depression during exercise (n = 1580) | Men with silent ST-depression during exercise (n = 189) | P-value for statistical significance | |
|---|---|---|---|
| Mean (SD) | Mean (SD) | ||
| Age (years) | 52.2 (5.3) | 52.7 (5.2) | 0.17 |
| Body mass index (kg/m2) | 26.8 (3.4) | 26.0 (3.1) | 0.002 |
| Smokers (%) | 30.2 | 27.1 | 0.36 |
| Cigarette smoking (pack-years)a | 7.99 (16.2) | 5.91 (13.1) | 0.05 |
| Alcohol consumption (g/week) | 76.3 (119.9) | 63.9 (84.5) | 0.07 |
| Diabetes (%)b | 4.0 | 4.2 | 0.87 |
| Serum low-density lipoprotein cholesterol (mmol/L) | 3.99 (0.99) | 4.15 (0.94) | 0.02 |
| Serum high-density lipoprotein cholesterol (mmol/L) | 1.31 (0.30) | 1.30 (0.27) | 0.83 |
| Systolic blood pressure (mmHg) | 133.6 (16.0) | 137.3 (17.4) | 0.006 |
| Diastolic blood pressure (mmHg) | 89.1 (10.3) | 88.6 (10.3) | 0.60 |
| C-reactive protein (mmol/L) | 2.11 (3.32) | 2.10 (3.63) | 0.97 |
| Resting heart rate (beats/min) | 62 (11) | 62 (10) | 0.78 |
| Maximal heart rate during exercise test (b.p.m.) | 160 (21) | 165 (17) | 0.001 |
| Maximal oxygen uptake (mL/min)c | 2534.8 (585.4) | 2476.9 (585.4) | 0.20 |
| Exercise capacity (METs) | 9.2 (2.1) | 9.1 (2.0) | 0.67 |
aPack-years denotes the lifelong exposure to smoking that was estimated as the product of years smoked and the number of tobacco products smoked daily at the time of examination.
bDiabetes was defined as fasting blood glucose of ≥6.1 mmol/L or a clinical diagnosis of diabetes with dietary, oral, or insulin treatment.
cExercise capacity was measured directly during exercise test using a respiratory gas analyser.