Table 5.

Internal consistency and Item-total correlation of the twelve Factors

Domain	Factors	Internal consistency (Cronbach's alpha)	Item-total correlation (Min-Max)	Items numbers
Work Station	Factor 1: Work area	0.46	0.18 to 0.39	9,10,15
	Factor 2: Computer position	0.43	0.14 to 0.37	11,13,14
Body Posture	Factor 3: Incorrect body posture	0.74	0.27 to 0.68	23,24,25,26
	Factor 4: Bad habits	0.76	0.45 to 0.66	17,18,19,20,21
Job Control	Factor 5: Skills and abilities	0.82	0.53 to 0.74	32,33,34,35
	Factor 6: Decision making	0.60	0.26 to 0.49	27,28,29,30
Job Demands	Factor 7: Time management	0.82	0.61 to 0.72	36,37,38,39
	Factor 8: Work overload	0.65	0.30 to 0.57	40.41.42
Break Time	Factor 9: Work breaks	0.80	0.61 to 0.70	43,44,45
	Factor 10: Variation in work	0.60	0.29 to 0.46	47,48,49
Social Support	Factor 11: Work environment	0.73	0.47 to 0.63	51, 52, 54
	Factor 12: Social support	0.68	0.34 to 0.63	55,56,57