Table 1 Working hours per week, sleep patterns, score sleepiness, chronotype and social jetlag of employees according to shift worked.

From: Night workers have lower levels of antioxidant defenses and higher levels of oxidative stress damage when compared to day workers

 

Night (n = 37)

Day (N = 42)

p-value

Working Hours/week

57.0 [42.0–69.0]

36.0 [36.0–40.0]

<0.001*

Working time (years)

5.00 [2.00–12.5]

4.00 [2.00–10.75]

0.348

Sleepiness Score ( Epworth )

10.76 ± 4.88

7.48 ± 4.00

0.002*

Daytime Sleepiness

16 (43.2)

9 (21.4)

0.037*

No sleepiness

21 (56.8)

33 (78.6)

 

Mean Sleep Duration (h)

Work days

3:50 [2:22–4:27]

6:35 [5:28–7:35]

<0.001*

Rest days

7:56 ± 1:58

8:33 ± 1:52

0.170

Chronotype (MSF E sc) (h)

3:44 ± 1:00

3:38 ± 1:25

0.708

Morning

21 (56.8)

29 (69.0)

0.260

Indifferent

12 (32.4)

7 (16.7)

 

Evening

4 (10.8)

6 (14.3)

 

Social Jetlag (h)

5:07 [2:35–7:53]

1:15 [0:45–2:02]

<0.001*

Yes

32 (86.5)

25 (59.5)

0.011*

No

5 (13.5)

17 (40.5)

 
  1. Values are presented as mean ± SD for normally distributed data or median (interquartile range) for non-normally distributed data. Comparisons between groups were done using the Student’s t-test or the Mann-Whitney test, for independent samples, for data with and without normal distribution, respectively, or by the Chi-square test, for variables expressed as frequency. *p < 0.05 indicates statistically significant difference. SJL was calculated based on the absolute difference between the average sleep time on working and rest days and was dichotomically categorized as >60 min (with SJL) or <60 min (without SJL).
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