Table 2 Descriptive statistics and intercorrelations of key variables

Variable	M	SD	1	2	3	4	5	6	7	8	9	10
1. Gender (0=man, 1=woman)	1.03	0.16
2. Age	36.84	8.69	.01
3. Marital status (0=unmarried, 1=married)	1.86	0.49	.03	.49**
4. Shift (0=day, 1=multiple)	1.62	0.49	-.15**	-.17**	-.05*
5. Poor sleep quality	5.98	3.56	.01	.03	.04	.07**
6. Smoking frequency	7.41	8.28	-.14**	.07**	.08**	.03	.12**
7. Alcohol consumption	2.00	1.00	-.15**	.06**	.04	-.06**	.09**	.20**
8. Physical exercise	1.04	1.32	.04*	.21**	.05*	-.14**	-.18**	-.09**	-.05*
9. Healthy eating	3.17	1.19	.10**	.01	-.02	-.11**	-.16**	-.11**	-.11**	.19**
10. Physical health QOL	84.68	25.71	.05*	.00	.01	-.05*	-.28**	-.06**	-.03	.09**	.17**
11. Mental health QOL	65.66	20.99	.02	.11**	.03	-.10**	-.42**	-.06**	-.06**	.18**	.20**	.36**

SD Standard deviation, Smoking frequency Number of cigarettes smoked per day, Alcohol consumption Frequency of drinking alcohol, Physical exercise Times per week a person engages in physical exercise activities, Healthy eating average number of fruits and vegetables eaten in one’s daily diet, QOL Quality of life
N = 2,129. * indicates p < .05. ** indicates p < .01. M = Mean

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