TABLE 1.

Demographics, descriptives and reliabilities for the samples of the Netherlands and Poland (N ranges from 1,150 to 4,200).

#	Variable	Range	α	M/%	SD	α	M/%	SD
			The Netherlands			Poland
	Age	18–64/70	–	38.20	9.73	–	38.72	7.63
	Age in two groups	–	–		–	–		–
	−≤40			57.3			57.9
	−>40			42.7			42.1
	Gender	–	–		–	–		–
	- Female			90.7			99.0
	- Male			9.3			1.0
	Type of institution	–	–		–	–		–
	- Hospital			62.8%			74.0%
	- Nursing home			18.7%			4.2%
	- Home care			18.5%			7.1%
1	T0 quantitative demands	1–5	0.70	2.99	0.55	0.69	3.38	0.66
2	T0 emotional demands	1–5	0.65	3.45	0.55	0.77	3.49	0.77
3	T0 physical demands	1–4	0.60	2.22	0.70	0.64	2.64	0.80
4	T0 interpersonal relations	1–4*	0.72	2.79	0.49	0.76	2.64	0.58
5	T0 psychological support (1 item)	1–4	–	2.72	0.58	–	2.21	0.80
6	T0 meaning of work	1–5	0.82	4.20	0.58	0.73	3.99	0.82
7	T0 influence at work	1–5	0.71	3.19	0.66	0.83	2.97	0.95
8	T0 opportunities development	1–5	0.70	3.62	0.77	0.76	3.67	0.83
9	T0 burnout	1–5	0.84	1.68	0.60	0.91	2.61	0.99
10	T0 disability**	1–10	0.31 (0.90)	0.46	1.11	0.57 (0.94)	1.46	1.59
11	T0 job satisfaction	1–4	0.70	2.84	0.37	0.78	2.39	0.55
12	T0 institutional commitment	1–5	0.76	3.21	0.66	0.75	3.43	0.88
13	T1 burnout	1–5	0.85	1.65	0.59	0.92	2.80	1.02
14	T1 disability**	1–10	0.34 (0.92)	0.42	1.10	0.47 (0.92)	1.34	1.58
15	T1 job satisfaction	1–4	0.73	2.85	0.40	0.79	2.32	0.56
16	T1 institutional commitment	1–5	0.78	3.05	0.68	0.74	3.25	0.80

*Original range 1–5, recoded into 1–4 (by combining scores 2 and 3) to make variable comparable to T1 measurement. **α between brackets after deletion of Item 1 (number of days kept off work due to Neck Shoulder/Low Backpain complaints). Disability score was calculated following the method described by the author (Von Korff et al., 1992).