Table 2 Demographics, comorbidity and pain characteristics at baseline among the control persons and the persons with chronic neck pain. SD = standard deviation, IQR = Interquartile range

n

Mean

Median

Min, Max

n

Mean

Median

Min, Max

(SD)

(IQR)

(SD)

(IQR)

Age (mean)

26

51

52.5

23,66

12

34.6

27

22, 61

[5, 12]

(47, 63)

(16,0)

(23, 53.5)

 Women

19

73

7

60

 Men

7

27

5

40

 Elementary school

4

15

0

0

 High school

9

35

6

50

 College, university

13

50

6

50

 1 Sedentary

1

4

1

8

 2 Moderate

15

58

4

33

 3 Regular

9

35

5

42

 4 Intense

1

4

2

17

Smoking (%)

4

16

0

0

Alcohol consumption (> 9 units/week)(%)

5

19

4

33

HADS – Anxiety

25

1.2

1.1

0.71, 2.00

12

1.2

1.1

0.71, 1.86

(0.40)

(0.86, 1.57)

(0.32)

(0.93, 1.29)

Work percentage

26

54

77.5

0, 100

12

88

100

5, 100

(47.2)

(0, 100)

(29.8)

(100, 100)

Sick leave or sickness benefit

26

26

0

0, 100

12

0

0

0, 0

(43.9)

(0.0,75.0)

(0.0)

(0, 0)

SMBQ

25

1.6

1.6

1.14, 2.55

12

1.4

1.5

0.64, 1.86

(0.37)

(1.32, 1.86)

(0.33)

(1.32, 1.55)

Sleep Quality (insomnia)

26

3.8

4.5

1.25, 5.25

12

4.6

4.6

3.75, 5.25

(1.30)

(2.50, 4.75)

(0.56)

(4.25, 5.00)

Awakening index

26

4.2

4.5

1.33, 6.00

12

4.7

5.0

1.67, 5.67

(1.32)

(3.00, 5.33)

(1.04)

(4.67, 5.33)

Sleepiness/fatigue

26

4.3

4.5

2.20, 6.00

12

4.6

4.6

3.00,6.00

(1.02)

(3.60, 5.00)

(0.91)

(4.20, 5.00)

Pain sites

26

10

9

0,23

4

1.75

1.5

1,3

(6.26)

(6.0, 13.0)

(0.96)

(1.0,2.5)