Table 1 Descriptive statistics with demographic variables, work related variables, pain, and sleep

Sex (female), n (%)

614 (90)

Age, year, mean ± SD

40.9 ± 11.1

Body mass index, kg/m², mean ± SD

24.7 ± 4.1

Percentage of full-time position (%)

 50–75%

21.6

 76–90%

19.7

  > 90%

58.0

Naps on the night shifts, n (%)^b

224 (34)

Morning shift, %^c, median (IQR)

52.9 (37.5–63.6)

Evening shift, %^c, median (IQR)

25.5 (14.3–35.9)

Night shift, %^c, median (IQR)

17.6 (6.7–33.3)

Neck-, shoulder-, and upper back pain, number of days, median (IQR)

4 (1–12)

Low back pain, number of days, median (IQR)

2 (0–7)

Pain in the upper extremities, number of days, median (IQR)

0 (0–3)

Pain in the lower extremities, number of days, median (IQR)

2 (0–9)

Headache, number of days, median (IQR)

4 (1–8)

TST, hours, mean ± SD

6.7 ± 1.0^a