Table 6.

Correlations between Sleep Measures and Stress Regarding Shift Work.

Sleep Quality Measure	Shift Work Stress	Hours of Sleep Work Nights	Hours of Sleep Off-Shift Nights	Days a Week Feeling Rested
Hours of sleep work nights	−00.16 **	—
Hours of sleep off-shift nights	−0.06 **	0.52 **	—
Days a week feeling rested	−0.20 **	0.39 **	0.20 **	—
Quality of sleep rating	−0.22 **	0.48 **	0.30 **	0.65 **

Quality of sleep measured on a 5-point Likert scale ranging from 1 (lowest) to 5 (highest); shift work stress measured on a 7-point Likert scale ranging from 0 (no stress) to 6 (a lot of stress); ** p < 0.001; correlations between single-item questions.