Table 4.

Spearman’s correlation coefficient between individual variables of the Pittsburgh Sleep Quality Index (PSQI) questionnaire and items of the Maslach Burnout Inventory (MBI)

PSQI	MBI	rho	p-value
Waking up in the middle of the night or early morning	I feel fatigued when I get up in the morning and have to face another day on the job	0.36	0.01*
Overall rating of sleep quality	I feel used up at the end of the workday	0.45	0.00*
Overall rating of sleep quality	I feel like I’m at the end of my rope	0.40	0.00*
Overall rating of sleep quality	I feel fatigued when I get up in the morning and have to face another day on the job	0.33	0.02*
Overall rating of sleep quality	I feel emotionally drained from my work	0.45	0.00*
Overall rating of sleep quality	Working with people directly puts too much stress on me	0.38	0.00*
Overall rating of sleep quality	I feel burned out from my work	0.42	0.00*
Overall rating of sleep quality	I feel I’m working too hard on my job	0.41	0.00*
Overall rating of sleep quality	I feel frustrated by my work	0.38	0.00*
Feeling unwell or lacking enthusiasm for activities of daily living	I feel I’m working too hard at my job	0.51	0.00*
Feeling unwell or lacking enthusiasm for activities of daily living	I feel used up at the end of the workday	0.34	0.01*
Feeling unwell or lacking enthusiasm for activities of daily living	I feel burned out from my work	0.47	0.01*

rho = association value, whose correlation coefficient can range from -1 to +1.

* Statistically significant values at p < 0.05.