Table 1.

Items and measures of internal consistency for the demands.

Dimension	Items	Internal Consistency (r) by Prümper et al. (1995)	Internal Consistency (r) Current Study
Qualitative workload	There are things in my work, which are too complicated (e.g., because of no or unclear job specification or insufficient qualification).	0.40	0.45**
	There are too high demands on my ability to concentrate.
Quantitative workload	I am often pressed for time.	0.70	0.71**
	I have too much work.
Work interruptions	I am often lacking required information, materials, and work equipment.	0.44	0.36**
	I consistently get interrupted during my work by other persons.
Work environment	There are adverse environmental factors at my work place like noise, climate, and dust.	0.60	0.58**
	Rooms and room facilities are insufficient at my work place.

** the correlation is significant p = 0.01 (2-tailed).