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Table 8 Discriminant validity using known groups (healthy controls vs narcolepsy patients)

From: The development of a health-related quality-of-life instrument for young people with narcolepsy: NARQoL-21

Scale (no. of items)

 

Mean (SD)

Min–max

P value

Cohen’s d

HrQoL (21)

Patient

59 (10)

20–92

  

Control

88 (10)

51–100

<0.001

2.114

Psychosocial (15)

Patient

58 (16)

15–90

  

Control

87 (11)

42–100

<0.001

2.253

Future outlook (6)

Patient

65 (21)

13–100

  

Control

91 (9)

67–100

<0.001

1.641

Emotional reaction (5)

Patient

61 (23)

5–95

  

Control

85 (14)

25–100

<0.001

1.288

Social confidence (4)

Patient

67 (20)

13–100

  

Control

83 (16)

31–100

<0.001

0.892

School/Concentration (6)

Patient

49 (19)

17–88

  

Control

90 (10)

58–100

<0.001

2.774

Expectations (3)

Patient

57 (25)

8–100

  

Control

88 (14)

33–100

<0.001

1.503

Limitations (3)

Patient

73 (23)

17–100

  

Control

95 (10)

58–100

<0.001

1.243