Table 2.

The statistical distribution of demographic variables among the participants

variable		Range		Mean		Standard deviation
Age (year)	21.00–55.00		36.62		8.23
Career length (Year)	1.00–40.00		12.74		7.84
Body mass index (kg/m2)	19.24–34.93		26.07		4.08
Activity rate (hours/week)	0.00–11.00		2.46		2.15
Smoking rate (cigarette/day)	0.00–20.00		3.39		1.56