Table 3 Multiple linear regression model (first line: coefficient; second line: standard error; third line: 95% confidence interval)

Constant (intercept)

46.90

-60.10

68.48*

-28.27

(43.85)

(60.50)

(32.44)

(36.29)

[-39.83, 133.62]

[-180.64, 58.65]

[4.32, 132.65]

[-100.04, 43.50]

Digital pain extent

1.24*

0.85

0.44

-0.38

(0.48)

(0.67)

(0.36)

(0.40)

[0.28, 2.19]

[-0.47, 2.17]

[-0.27, 1.15]

[-1.17, 0.41]

Gender

2.95

9.47

0.18

6.17

(4.66)

(6.42)

(3.45)

(3.85)

[-6.26, 12.16]

[-3.24, 22.18]

[-6.64, 6.99]

[-1.45, 13.79]

Age

-0.22

-0.27

0.08

0.13

(0.17)

(0.24)

(0.13)

(0.14)

[-0.56, 0.12]

[-0.74, 0.20]

[-0.17, 0.33]

[-0.15, 0.41]

Height

9.89

69.70*

-3.67

33.23

(24.24)

(33.45)

(17.94)

(20.06)

[-38.06, 57.84]

[3.55, 135.85]

[-39.14, 31.80]

[-6.45, 72.90]

Duration of symptoms

0.98

-7.75

2.06

1.99

(2.93)

(4.04)

(2.17)

(2.43)

[-4.82, 6.78]

[-15.75, 0.25]

[-2.23, 6.35]

[-2.81, 6.79]

Comorbidity

-0.19

-0.88

3.25

-0.20

(2.93)

(4.04)

(2.17)

(2.42)

[-5.99, 5.60]

[-8.88, 7.11]

[-1.04, 7.54]

[-4.99, 4.60]

Educational level

-8.10***

-9.65***

-2.09

3.02*

(1.72)

(2.37)

(1.27)

(1.42)

[-11.50, -4.70]

[-14.34, -4.96]

[-4.61, 0.42]

[0.20, 5.83]

Current treatment

Pharmacological

7.87

24.01*

-2.91

-8.48

(5.92)

(8.16)

(4.38)

(4.90)

[-3.83, 19.57]

[7.87, 40.15]

[-11.57, 5.74]

[-18.16, 1.20]

Physiotherapy

16.11***

30.70***

0.20

-10.38*

(3.89)

(5.37)

(2.88)

(3.22)

[8.42, 23.81]

[20.09, 41.32]

[-5.49, 5.90]

[-16.75, -4.01]

Other treatments

13.23

30.08**

-2.67

-4.50

(7.00)

(9.66)

(5.18)

(5.79)

[-0.61, 27.07]

[10.98, 49.17]

[-12.92, 7.57]

[-15.96, 6.95]

Employment Status

Housework

3.97

6.35

1.62

-1.90

(4.27)

(5.90)

(3.16)

(3.54)

[-4.48, 12.42]

[-5.31, 18.00]

[-4.62, 7.87]

[-8.89, 5.09]

Retirement

-0.19

14.93*

4.30

-1.92

(4.76)

(6.57)

(3.52)

(3.94)

[-9.60, 9.23]

[1.94, 27.93]

[-2.67, 11.26]

[-9.72, 5.87]

Sick leave

23.35**

31.79**

-2.06

-10.50

(6.24)

(8.61)

(4.62)

(5.16)

[11.01, 35.69]

[14.77, 48.82]

[-11.19, 7.07]

[-20.71, -0.29]

Unemployment

4.19

3.66

-2.86

-2.50

(4.60)

(6.35)

(3.41)

(3.81)

[-4.91, 13.30]

[-8.90, 16.22]

[-9.60, 3.87]

[-10.03, 5.03]