Table 1.

Characteristics of the study population

	All	Males	Females
Age
20 - 29 years	104 (23.6%)	41 (21.8%)	63 (25.0%)
30 - 39 years	116 (26.4%)	44 (23.4%)	72 (28.6%)
40 - 49 years	129 (29.3%)	59 (31.4%)	69 (27.4%)
≥50 years	91 (20.7%)	44 (23.4%)	48 (19.0%)
Number of working years in current position
1 to 5 years	132 (30.0%)	63 (33.5%)	69 (27.4%)
6 to 10 years	107 (24.3%)	47 (25.0%)	60 (23.8%)
11 to 15 years	94 (21.4%)	40 (21.3%)	54 (21.4%)
15 years and more	107 (24.3%)	38 (20.2%)	69 (27.4%)
Number of working hours with computer/day
2 to 5 hrs	107 (24.3%)	63 (33.5%)	44 (17.5%)
6 to 9 hrs	248 (56.4%)	81 (43.1%)	167 (66.3%)
> 9 hrs	85 (19.3%)	44 (23.4%)	41 (16.3%)