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Table 3 Distribution of the Patient Enablement Instrument for Back Pain (PEI-BP) scores at baseline based on 272 patients with non-specific low back pain (the GLA:D® Back cohort)

From: The patient enablement instrument for back pain: reliability, content validity, construct validity and responsiveness

Item

Response categories, N (%)

Missing

N (%)

Skewness*

Kurtosis#

To a very low degree

         

To a very high degree

0

1

2

3

4

5

6

7

8

9

10

Q1: Handle your everyday life

1 (0.4)

0 (0.0)

0 (0.0)

7 (2.6)

5 (1.9)

32 (11.8)

24 (8.8)

39 (14.3)

56 (20.6)

52 (19.1)

55 (20.2)

1 (0.4)

−0.7

3.2

Q2: Understand your back problem

6 (2.2)

4 (1.5)

10 (3.7)

11 (4.0)

17 (6.3)

25 (9.2)

26 (9.6)

36 (13.2)

44 (16.2)

45 (16.5)

43 (15.8)

5 (1.8)

−0.8

2.9

Q3: Manage your back problem

0 (0.0)

1 (0.4)

11 (4.0)

12 (4.4)

16 (5.9)

29 (10.7)

34 (12.5)

41 (15.1)

50 (18.4)

41 (15.1)

32 (11.8)

5 (1.8)

−0.5

2.5

Q4: Keep your back in good health

6 (2.2)

7 (2.6)

18 (6.6)

20 (7.4)

28 (10.3)

52 (19.1)

33 (12.1)

31 (11.4)

34 (12.5)

25 (9.2)

12 (4.4)

6 (2.2)

−0.2

2.4

Q5: Feel confident with your health

5 (1.8)

7 (2.6)

26 (9.6)

18 (6.6)

20 (7.4)

42 (15.4)

22 (8.1)

25 (9.2)

41 (15.1)

35 (12.9)

27 (9.9)

4 (1.5)

−0.3

2.0

Q6: Manage your life independently

0 (0.0)

2 (0.7)

1 (0.4)

3 (1.1)

7 (2.6)

11 (4.0)

7 (2.6)

20 (7.4)

39 (14.3)

63 (23.2)

117 (43.0)

2 (0.7)

−1.7

5.9

  1. *A measure of the degree and direction of asymmetry of a distribution. A symmetric (normal) distribution has a skewness of 0, and a distribution skewed to the left has a negative coefficient (e.g. when the median is greater than the mean)
  2. #A measure of tailedness of a distribution. A normal distribution has a coefficient of kurtosis of 3, the smaller the coefficient of kurtosis, the flatter the distribution