Table 1.

Demographic characteristics of the office workers

Items	Whole group (n=969)	Males (n = 359)	Females (n = 610)
Age	28.5 (6.39)	29.2 (5.92)	28.1 (6.63)
BMI	20.8 (3.11)	22.2 (3.18)	20.1 (2.79)
Working experience (yr)	6.4 (5.99)	6.8 (5.89)	6.1 (1.77)
Handedness
Right-handed	892 (92.1%)	322 (89.7%)	570 (93.4%)
Left-handed	52 (5.4%)	26 (7.3%)	26 (4.3%)
Education
Secondary or below	106 (10.9%)	39 (10.9%)	67 (11.3%)
Diploma level	300 (31.0%)	104 (29.0%)	196 (32.1%)
Bachelor level	418 (43.1%)	172 (47.9%)	246 (40.3%)
Master level or above	120 (12.4%)	39 (10.9%)	81 (13.3%)
Marital status
Single	465 (48.0%)	171 (47.6%)	294 (48.2%)
Married	376 (38.8%)	146 (40.7%)	230 (37.7%)
Divorced	4 (0.4%)	3 (0.8%)	1 (0.2%)
Other	95 (9.8%)	30 (8.4%)	65 (10.7%)
Smoking
Yes	112 (11.6%)	96 (26.7%) *	16 (2.6%) *
No	823 (84.9%)	250 (69.6%)	573 (93.9%)
Physical exercise
Yes	456 (47.1%)	202 (56.3%) *	254 (41.6%) *
No	489 (50.5%)	149 (41.5%)	340 (55.7%)
Working days per week (d/w, mean (SD))	5.4 (1.39)	5.4 (0.67)	5.4 (1.68)
Daily working hours (hr/d, mean (SD))	8.3 (1.53)	8.4 (1.71)	8.2 (1.41)
Daily computer use time (hr/d, mean (SD))	7.9 (2.55)	7.9 (3.03)	7.8 (2.23)
Daily keyboard use time (hr/d, mean (SD))	6.2 (2.78)	6.0 (3.09)	6.3 (2.56)
Sleep hours per day (hr/d, mean (SD))	7.3 (1.01)	7.2 (0.88)	7.4 (1.07)

Note: Mean values (SD) present for age, BMI, working experience, working days per week, daily working hours, daily computer and keyboard use and sleep hours per day, while handedness, education level, marriage status, smoking and exercise are expressed as counts (% of respective group). * represents p < 0.05 and means there were significant differences between men and women workers. Abbreviations: BMI body mass index, yr year, SD standard deviation, d/w days per week, hr./d hours per day