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Table 3 Description of sleep variables according to gender and work shift, of workers in southern Brazil (n: 130)

From: Night shift work, short sleep and obesity

MCTQ

General

Women

Men

 

Day

Night

p-value

Day

Night

p-value

Day

Night

p-value

Sleep midpoint working days (hours)

3:41 (2:48 to 4:31)

5:30 (4:09 to 10:30)

< 0.001**

3:45 (2:47 to 4:27)

4:45 (4:09 to 10:17)

< 0.001**

3:38 (2:47 to 4:38)

9:25 (5:07 to 12:38)

< 0.001**

Sleep duration working days (hours)

7:03 ± 1:39

6:00 ± 2:27

0.007*

7:11 ± 1:48

6.09 ± 2:39

0.040*

6:57 ± 1:20

5:50 ± 2:20

0.080*

Sunlight working days (hours)

1:00 (0:18 to 2:00)

1:00 (0:25 to 3:00)

0.433**

1:00 (0:30 to 2:00)

2:00 (0:40 to 3:00)

0.081**

2:00 (1:00 to 3:30)

1:00 (0:45 to 3:08)

0.262**

Sleep midpoint days off (hours)

4:47 (4:03 to 5:42)

4:30 (3:48 to 5:53)

0.772**

4:50 (3:40 to 6:00)

4:30 (4:00 to 5:40)

0.650**

4:40 (4:08 to 5:30)

4:57 (3:06 to 6:21)

0.783**

Sleep duration days off (hours)

8:10 ± 1:59

7:40 ± 2:12

0.046**

8:18 ± 2:21

7.54 ± 2:14

0.111**

8:01 ± 1:45

7:09 ± 2:18

0.191**

Sunlight days off (hours)

3:00 (2:00 to 5:00)

3:00 (1:09 to 4:09)

0.168**

2:45 (2:00 to 4:53)

2:30 (1:00 to 5:00)

0.741**

4:00 (3:00 to 6:30)

3:00 (1:11 to 4:00)

0.048**

Social jetlag

1:03 (0:06 to 1:56)

− 0:27 (− 6:26 to 0:06)

< 0.001**

1:00 (0:00− 2:17)

0:00 (− 5:47 to 0:12)

< 0.001**

1:15 (0:30− 1:45)

− 1:30 (− 7:50 to 0:05)

< 0.001**

Does not use alarm clock on days off

59 (85.5)

35 (62.5)

0.006##

40 (85.1)

26 (65.0)

0.053##

19 (86.4)

9 (56.3)

0.088##

Awakes with the alarm clock

26 (52.0)

7 (24.1)

0.029##

18 (54.5)

4 (20.0)

0.029##

8 (47.1)

3 (33.3)

0.797##

  1. * Student t test; ** Mann–Whitney test
  2. ##Pearson’s Chi Square test with continuity