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Table 2 Characteristics of study subjects at baseline

From: Impact of shift work on the diurnal cortisol rhythm: a one-year longitudinal study in junior physicians

Variables

Shift work: No

Shift work: Yes

p

Total (N = 70)

N = 51

N = 19

Age (years)

(mean ± SD)

30.57 ± 2.48

30.74 ± 3.05

0.8138

30.61 ± 2.63

Working hours per week

(mean ± SD)

50.82 ± 10.27

50.95 ± 7.08

0.9616

50.86 ± 6.46

Gender

Men

25, 49.02%

5, 26.32%

0.0878

30, 42.86%

Women

26, 50.98%

14, 73.68%

 

40, 57.14%

Partnership

No

12, 23.53%

5, 26.32%

0.8090

17, 24.29%

Yes

39, 76.47%

14, 73.68%

 

53, 75.71%

Children

No

43, 84.31%

15, 78.95%

0.5963

58, 82.86%

Yes

8, 15.69%

4, 21.05%

 

12, 17.14%

Professional tenure

≤ 2 years

27, 52.94%

7, 36.84%

0.2307

34, 48.57%

>  2 years

24, 47.06%

12, 63.16%

 

36, 51.43%

Smoking

No

42, 82.35%

17, 89.47%

0.4666

59, 84.29%

Yes

9, 17.65%

2, 10.53%

 

11, 15.71%

Risky alcohol use

No

45, 88.24%

18, 94.74%

0.4201

63, 90.00%

Yes

6, 11.76%

1, 5.26%

 

7, 10.00%

Physical activity

Inactive

13, 25.49%

5, 26.32%

0.9440

18, 25.71%

Active

38, 74.51%

14, 73.68%

 

52, 74.29%

Overweight and obesity

No

45, 88.24%

15, 78.95%

0.3234

60, 85.71%

Yes

6, 11.76%

4, 21.05%

 

10, 14.29%

Cortisol at waking, 0 h (ng/ml)

(mean ± SD)

7.90 ± 4.82

8.36 ± 3.55

0.7003

8.02 ± 4.50

Cortisol at +4 h

(mean ± SD)

2.90 ± 2.34

2.84 ± 1.46

0.9029

2.88 ± 2.13

Cortisol at + 8 h

(mean ± SD)

1.98 ± 1.19

1.59 ± 0.98

0.2078

1.87 ± 1.15

Cortisol at + 16 h

(mean ± SD)

0.91 ± 0.70

0.83 ± 0.65

0.6567

0.89 ± 0.68

Cortisol slope

(mean ± SD)

−0.38 ± 0.24

− 0.41 ± 0.17

0.6137

− 0.39 ± 0.22

Total cortisol AUC (ng/ml × hours)

(mean ± SD)

42.91 ± 20.55

40.95 ± 14.30

0.7037

42.38 ± 18.98

  1. Difference determined by Student’s t-test or Chi-square test