Table 1 . Descriptive statistics of variables for employees (n=451) .

Variable	Control group (n=251) Median (IQR)	Trial groups(n=200) Median (IQR)	p
Age (year)	30 (2)	31 (5)	0.08
Work experience (year)	7 (4)	7 (3)	0.32
Body Mass Index (kg/m2)	24.44 (3.79)	24.22 (3.72)	0.85