Table 2. Statistical analysis of differences between end and beginning of the shift for stress symptoms and their correlations with mean difference of VAS along shift (end shift minus beginning of the shift).

Stress symptoms	Mean ± SDa	T-Test values	Spearman rho
Stiff neck	0.21 ± 0.08	−1.49	0.483**
Tiredness in the eyes or heavy head	0.39 ± 0.95	−2.34*	0.414*
Uncomfortable abdominal pain or stomach ache	0.32 ± 0.73	−2.60*	0.339
Difficulty to keep the body straight	0.06 ± 0.89	−0,39	0.639**
Lack of concentration	0.29 ± 0.84	−2.05*	0.503**
Difficulty to think, and make decisions	0.44 ± 0.96	−2.69*	0.435*
Anxiety	0.15 ± 0.66	−1.30*	0.365*
Difficulty in controlling reactions	0.21 ± 0.54	−2.23*	0.225

Notes.

^aEnd shift–beginning of the shift.

^*p < .05.

^**p < .005.

SD

standard deviation