Table 1.

Correlation analysis of perceived organization support, psychological capital, occupational stress, and insomnia.

Variables	Organization support	Occupational stress		Psychological capital	Insomnia
		ERR	Overcommitment
1. Organization support	1
2. ERR	−0.318***	1
3. Overcommitment	−0.328***	0.586***	1
4. Psychological capital	0.455***	−0.275***	−0.339***	1
5. Insomnia	−0.358***	0.379***	0.466***	−0.402***	1
Mean	45.43	0.76	16.26	101.59	7.70
Standard deviation	9.83	0.42	5.61	17.02	4.62

ERR means effort-reward ratio.

^***p<0.001.