Skip to main content

Table 1 Patient characteristics and missing data information (n = 628)

From: Variable selection under multiple imputation using the bootstrap in a prognostic study

 

Trial 1 (n = 134)

Trial 2 (n = 195)

Trial 3 (n = 299)

Missing (%)

Value

Age (mean years ± sd)

0

40.6 (9.5)

Gender (male, %)

0

71.0

Education (%)

26.1

73.9

Smoking (%)

7.5

43.8

Self-predicted certainty at 6 months (%)

24.4

75.6

Physical activity (mean ± sd)

 

44.6

8.8 (1.0)

Bodyweight (kg) (mean ± sd)

3.3

81.1 (15.8)

Height (cm) (mean ± sd)

3.3

176.6 (9.4)

Quality of life (mean ± sd)

2.7

0.5 (0.07)

Years working in current job (median, IQR)

 

24.2

35.0 (28)

Full work absence (vs partial) (%)

0.8

67.0

Job satisfaction (%)

 

2.9

97.1

Job Content Questionnaire:

     

   Job control (mean ± sd)

 

25.6

56.2 (9.2)

   Job demands (mean ± sd)

 

24.7

33.1 (4.8)

   Social support (mean ± sd)

 

24.8

22.5 (4.1)

Daily exposed to:

     

   Vibration tools (%)

 

27.1

5.7

   Lifting >25 kg (%)

 

24.2

15.3

   Bending and twisting of the trunk (%)

 

24.2

20.2

   Whole body vibration (%)

 

26.4

7.8

   Sitting (%)

 

24.7

14.2

   Working with hands under knee level (%)

 

25.0

6.6

   Stooping (%)

 

25.2

19.6

Duration of complaints (weeks) prior to randomization; (median, IQR)

33.3

5.8 (13.3)

Pain radiation in 1 or both legs (%)

2.1

33.8

Functional status (RDQ) (mean ± sd)

5.1

11.3 (5.2)

Pain intensity (VAS) in (mean ± sd)

3.0

6.2 (1.9)

Treatment during enrollment (%)

23.6

76.7

Pain intensity at 3 months (VAS) (mean ± sd)

17.8

4.5 (2.5)

Functional status at 3 months (RDQ) (mean ± sd)

19.9

8.8 (6.1)

Change in pain intensity* (VAS) (mean ± sd)

20.0

2.2 (2.8)

Pain coping, active (mean ± sd)

5.6

6.7 (1.2)

Pain coping, passive (mean ± sd)

7.0

6.5 (1.3)

Fear avoidance beliefs (FAB) (mean ± sd)

 

48.1

19.5 (9.7)

Kinesiophobia (Tampa) (mean ± sd)

6.2

39.8 (6.7)

Body mass index

4.1

25.9 (4.0)

  1. * Average of prognostic indicators representing change in pain.