Table 2.

Item difficulties and unidimensional test by MNSQ within 0.60 and 1.40

	Strongly disagree, Disagree, Agree, Strongly agree	Difficulty	S.E.	Infit	Outfit
SD	01.My job requires that I learn new things	-2.18	0.05	1.00	1.01
	02.*My job involves a lot of repetitive work	2.42	0.04	1.01	1.11
	03.My job require me it be creative	-0.86	0.05	0.96	0.94
	05.My job requires a high level of skill	-0.76	0.05	1.25	1.23
	07.I get to do a variety of different things on my job	-0.82	0.05	1.19	1.17
	09.I have an opportunity to develop my own special ability	0.25	0.04	0.92	0.93
DA	04.My job allows me to make a lot of decision on by job	0.02	0.04	1.00	1.00
	06.*On my job, I have very little freedom to decide how I do my work	0.41	0.04	1.07	1.10
	08.I have a lot of influence about what happens on my job	0.48	0.04	0.90	0.92
PD	10.* My job require working very fast	2.18	0.04	1.29	1.38
	11.*My job requires working very hard	2.46	0.04	1.25	1.33
	12.I am not asked to do an excessive amount of work	1.44	0.04	1.34	1.38
	13.I have enough time to get the job done	0.55	0.04	1.27	1.29
	14.I am free of conflicting demands that others make	2.76	0.04	1.10	1.23
SS	15.My supervisor is concerned about the welfare of those under them	-0.5	0.04	0.98	0.95
	16.My supervisor pays attention to what I am saying	-0.62	0.04	0.76	0.73
	17.My supervisor is helpful in getting the job done	-0.83	0.05	0.76	0.73
	18.My supervisor is successful in getting people to work together	-0.76	0.05	0.78	0.74
CS	19.People I work with are competent in doing their jobs	-1.14	0.05	0.77	0.74
	20.People I work with take a personal interest in me	-1.42	0.05	0.69	0.68
	21.People I work with are friendly	-1.52	0.05	0.74	0.72
	22.When needed, my colleagues will help me?	-1.54	0.05	0.74	0.73

Note. * reverse scoring response

SD: skill discretion, DA: decision authority, PD: psychological job demand, SS: supervisor support, CS: coworker support