Table
3: Sleep
habits, sleepiness symptoms, Berlin Questionnaire and “work commute” traffic
accidents of 501 survey participants, according to work shift.
|
Sleep
habits |
All |
Day
shift |
Night
shift |
|
|
n
= 501 |
n
= 404 |
n
= 97 |
p |
|
|
Weekday
(or workday) hours of sleep, mean (SD) |
6.8
(1.1) |
6.8
(0.9) |
6.6
(1.5) |
0.088 |
|
Weekday (or workday) hours of sleep < 7 h,
n (%) |
220
(43.9) |
167
(41.3) |
53
(54.6) |
0.039 |
|
Weekday (or workday) hours of sleep < 6 h,
n (%) |
64
(12.8) |
40
(9.9) |
24
(25.3) |
<
0.001 |
|
24-hr
weekday sleep (night + nap sleep), mean (SD) |
7.8
(1.9) |
7.8
(1.2) |
7.4
(1.9) |
0.089 |
|
Weekend
(or non-workday ) hours of sleep, mean (SD) |
8.1
(1.3) |
8.1
(1.2) |
8.3
(1.4) |
0.310 |
|
Sleep
debt (minutes), median (IQR) |
60.0
(0.0-120.0) |
60.0
(0.0-120.0) |
94.5
(23.9-168.0) |
0.027 |
|
Regular
bedtime, n (%) |
362
(72.3) |
306
(75.7) |
56
(57.7) |
0.001 |
|
Sleep
latency (min), median (IQR) |
12.5
(5.0-22.5) |
12.5
(5.0-22.5) |
15.0
(7.0-30.0) |
0.266 |
|
Nap,
n (%) |
127
(25.3) |
78
(19.3) |
49
(50.5) |
<
0.001 |
|
Nap
duration (min), median (IQR) [n = 127] |
37.5
(30.0-60.0) |
37.0
(25.0-60.0) |
45.0
(30.0-90.0) |
0.018 |
|
Use
of sleep medication, n (%) |
|
|
|
|
|
Never
(0 per month) |
411
(82.0) |
338
(83.3) |
73
(76.8) |
0.229 |
|
Rarely
(once per month) |
42
(8.3) |
30
(7.4) |
12
(12.6) |
|
|
Sometimes
(2-4 per month) |
22
(4.5) |
17
(4.2) |
5
(5.3) |
|
|
Often
(5-15 per month) |
9
(1.8) |
8
(1.9) |
1
(1.1) |
|
|
Almost
always (16-30 per month) |
17
(3.4) |
13
(3.2) |
4
(4.2) |
|
|
Sleepiness
symptoms |
|
|
|
|
|
Epworth Sleepiness Scale score > 10, n
(%) |
33
(6.6) |
22
(5.4) |
11
(11.3) |
0.054 |
|
Risk
of sleep apnea (Berlin Questionnaire) |
|
|
|
|
|
High risk of sleep apnea |
64
(12.8) |
50
(12.4) |
14
(14.4) |
0.751 |
|
Traffic
accidents |
|
|
|
|
|
“Work commute” traffic accidents, n (%) |
54
(10.8) |
42
(10.4) |
12
(12.4) |
0.751 |
Abbreviations: IQR: Inter Quartile Range; SD: Standard
Deviation