Table 2. Significance of differences in pooled results on the scale of sleep and fatigue, energy and workload.

	Group	M	SD	t	df	p value
Fatigue	First shift	3.01	.993	-5.607	155	<0.001*
	Night shift	3.88	.933
Fatigue	First shift	3.01	.993	-3.953	155	<0.001*
	Daily shift	3.68	1.099
Sleep difficulties and fatigue	First shift	17.40	2.751	-4.167	155	<0.001*
	Shift work	19.20	2.673
Lack of energy	First shift	2.49	0.853	-1.265	155	0.208
	Shift work	2.66	0.821
Workload in the morning	First shift	11.95	3.688	-5.866	155	<0.001*
	Shift work	15.26	3.389
Workload in the afternoon	First shift	8.06	4.840	-10.196	129	<0.001*
	Shift work	14.66	3.114
Workload at night	First shift	6.01	4.093	-15.490	155	<0.001*
	Shift work	15.36	3.454

*p<0.05