Table 3. Correlation matrix for the work stress measures within participants included in analysis.

	control	demand	support	job strain	effort	reward
demand	0.20*
support	0.23*	−0.17*
job strain	−0.47*	0.75*	−0.32*
effort	0.08**	0.68*	−0.18*	0.56*
reward	0.28*	−0.29*	0.49*	−0.44*	−0.37*
ERI ratio	−0.05**	0.66*	−0.31*	0.57*	0.94*	−0.61*

The spearman rank correlation coefficient (P) are reported

^*p<0.001, ** p<0.05