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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