Table 1. Description of baseline characteristics in 439 men.

	% (N) or mean (SD) or median (IQR)
Age in years: mean (SD)	46.4 (4.2)
Educational level: % (N)
Low	22.5 (98)
Medium	65.5 (285)
High	12.0 (52)
Occupational class: % (N)
White-collar	75.2 (330)
Blue-collar	24.8 (109)
Current smoker: % (N)	41.9 (184)
Body mass index (kg/m²): mean (SD)	25.3 (2.7)
Weight group: % (N)
Normal weight (BMI<25kg/m²)	45.8 (201)
Overweight (25kg/m²≤BMI<30kg/m²)	49.9 (219)
Obesity (BMI≥30kg/m²)	4.3 (19)
Systolic blood pressure (mmHg): mean (SD)	132.2 (13.5)
Diastolic blood pressure (mmHg): mean (SD)	81.9 (10.6)
Total cholesterol (mg/dl): mean (SD)	234.7 (33.6)
HDL cholesterol (mg/dl): mean (SD)	54.7 (14.3)
Cardiorespiratory fitness (watts/kg): mean (SD)	1.46 (0.27)
Occupational physical activity: median kcal/working hour (IQR)	1,567 (1,221–2,184)
Groups of occupational physical activity: median kcal/working hour (IQR)
Low (n = 147; 33.5%)	1,114 (1,023–1,222)
Medium (n = 145; 33.0%)	1,567 (1,435–1,814)
High (n = 147; 33.5%)	2,484 (2,184–2,940)
Heavy leisure time physical activity: median total kcal in last 3 months (IQR)	1,080 (0–5,280)
Groups of heavy leisure time physical activity: median total kcal in last 3 months (IQR)
Low (n = 183; 41.7%)	0 (0–0)
Medium (n = 123; 28.0%)	1,584 (1,056–2,560)
High (n = 133; 30.3%)	7,920 (5,760–13,524)
Resting clinical heart rate: mean beats/min (SD)	69.7 (11.1)
Groups of resting clinical heart rate: mean beats/min (SD)
Low (n = 141; 32.1%)	58.1 (4.4)
Medium (n = 152; 34.6%)	68.5 (2.7)
High (n = 146; 33.3%)	82.1 (7.7)
Ambulatory 24-hour heart rate: mean beats/min (SD)	81.8 (8.9)
Groups of ambulatory 24-hour heart rate: mean beats/min (SD)
Low (n = 146; 33.3%)	72.3 (4.8)
Medium (n = 146; 33.3%)	81.8 (2.0)
High (n = 147; 33.5%)	91.1 (5.6)

SD, standard deviation; BMI, body mass index; IQR, inter-quartile range.