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Table 3 Descriptive analysis of the SF-36 item scores

From: Psychometric study of the SF-36v2 in hereditary angioedema due to C1 inhibitor deficiency (C1-INH-HAE)

General group of items n = 35

Item no

No answers (%)

Min–max

Value

Floor effect (%)

Ceiling effect (%)

Mean

Standard deviation

Corrected homogeneity index

Cronbach’s α

Physical functioning

SF3a

1.0

1–3

27.9

36.2

2.08

0.80

0.57

0.90

Physical functioning

SF3b

1.4

1–3

6.3

65.0

2.59

0.61

0.71

Physical functioning

SF3c

1.4

1–3

7.0

66.8

2.60

0.62

0.63

Physical functioning

SF3d

3.4

1–3

7.9

66.4

2.59

0.63

0.74

Physical functioning

SF3e

2.8

1–3

1.4

88.3

2.87

0.38

0.67

Physical functioning

SF3f

1.7

1–3

6.3

72.6

2.66

0.59

0.64

Physical functioning

SF3g

1.4

1–3

7.3

73.1

2.66

0.61

0.77

Physical functioning

SF3h

1.7

1–3

8.1

78.2

2.70

0.61

0.71

Physical functioning

SF3i

1.7

1–3

3.5

88.4

2.85

0.45

0.63

Physical functioning

SF3j

1.4

1–3

2.4

89.5

2.87

0.40

0.51

Role physical

SF4a

1.7

1–5

3.2

43.9

3.95

1.13

0.82

0.93

Role physical

SF4b

1.7

1–5

3.2

38.2

3.80

116

0.89

Role physical

SF4c

1.7

1–5

3.5

45.6

3.93

1.19

0.84

Role physical

SF4d

1.4

1–5

3. 8

46.5

3.95

1.17

0.83

Bodily pain

SF7*

1.0

1–6

4.9

25.8

4.9

1.56

0.87

0.91

Bodily pain

SF8*

1.7

1–6

6.0

36.5

3.92

1.59

0.87

General health

SF1*

1.7

1–5

6.0

6.7

3.07

1.07

0.65

0.82

General health

SF11a

2.1

1–5

14.4

29.2

3.24

1.46

0.57

General health

SF11b*

2.4

1–5

17.3

13.4

2.94

1.32

0.65

General health

SF11c

2.1

1–5

3.5

30.6

3.57

1.16

0.49

General health

SF11d*

2.4

1–5

21.2

9.5

2.85

1.34

0.72

Vitality

SF9a*

1.7

1–5

4.2

11.2

3.44

1.01

0.62

0.82

Vitality

SF9e*

1.4

1–5

7.3

6.6

3.17

1.05

0.64

Vitality

SF9g

1.4

1–5

4.2

14.3

3.33

1.04

0.65

Vitality

SF9i

1.4

1–5

9.1

4.5

2.96

0.98

0.63

Social functioning

SF6*

1.4

1–5

2.4

45.8

3.97

1.16

0.70

0.82

Social functioning

SF10*

1.7

1–5

2.1

36.1

3.93

1.01

0.70

Role emotional

SF5a

1.7

1–5

2.5

52.6

4.13

1.09

0.86

0.92

Role emotional

SF5b

2.1

1–5

3.2

48.6

4.07

1.10

0.88

Role emotional

SF5c

1.7

1–5

2.5

49.8

4.11

1.06

0.76

Mental health

SF9b

1.0

1–5

5.6

17.8

3.45

1.11

0.69

0.87

Mental health

SF9c

1.7

1–5

1.8

50.2

4.18

1.01

0.74

Mental health

SF9d*

2.4

1–5

4.9

5.7

3.20

1.01

0.69

Mental health

SF9f

1.4

1–5

1.7

29.4

3.82

0.99

0.70

Mental health

SF9h*

1.7

1–5

3.5

13.7

3.52

0.99

0.62

  1. * Items SF1, SF6, SF7, SF8, SF9a, SF9d, SF9g, SF9h, SF10, SF11b, SF11d were recoded as indicated in the Methods section
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Orphanet Journal of Rare Diseases

ISSN: 1750-1172