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Table 1 Scale internal alphas (Alpha 1, current study; Alpha 2, previous study) and scores (means ± S.D.) of the Nightmare Experience Questionnaire (NEQ), Family Relationship Questionnaire (FRQ), and Plutchik - van Praag Depression Inventory (PVP), in nightmare disorder patients (Patients, n = 62) and healthy volunteers (Controls, n = 135)

From: Nightmare experience and family relationships in healthy volunteers and nightmare disorder patients

Scale

Alpha 1

Alpha 2

Patients

Controls

95% Confidence Interval

NEQ

 Physical Effect

.80

.85

10.00 ± 3.90*

6.64 ± 2.28

2.30 ~  4.42

 Negative Emotion

.80

.80

19.13 ± 4.04*

17.25 ± 4.75

.50 ~  3.25

 Meaning Interpretation

.62

.65

16.50 ± 3.57*

13.53 ± 4.11

1.78 ~  4.17

 Horrible Stimulation

.68

.69

14.44 ± 4.14*

12.21 ± 4.26

.94 ~  3.50

 Annual Frequency

  

32.45 ± 27.78*

2.10 ± 0.80

23.29 ~  37.40

FRQ

 General Attachment

.60

.64

16.60 ± 3.61*

17.78 ± 3.71

−2.29 ~ − .07

 Maternal Encouragement

.70

.71

14.92 ± 4.04*

16.75 ± 4.07

−3.06 ~ − .60

 Maternal Abuse

.79

.79

8.21 ± 3.45

7.97 ± 3.87

−.90 ~  1.37

 Maternal Freedom Release

.86

.84

17.39 ± 4.61*

18.87 ± 4.25

−2.80 ~ − .16

 Maternal Dominance

.67

.65

12.05 ± 3.74

11.86 ± 3.38

−.87 ~  1.25

 Paternal Encouragement

.78

.74

12.26 ± 4.50

12.96 ± 4.67

−2.10 ~ .70

 Paternal Abuse

.65

.77

8.47 ± 3.99*

7.24 ± 2.48

.13 ~  2.32

 Paternal Freedom Release

.86

.83

17.10 ± 4.82*

18.75 ± 4.37

−3.02 ~ − .28

 Paternal Dominance

.61

.62

11.63 ± 3.38

11.47 ± 3.64

−.92 ~  1.24

PVP

.85

.94

14.42 ± 8.05*

10.17 ± 6.30

1.95 ~  6.55

  1. Note: *p < .05 vs. healthy volunteers