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Table 4 Parallel analysis (principle components analysis with the method of raw data permutation) of the DASS-21 and the DASS-17

From: Factor structure of the depression anxiety stress Scale-21 (DASS-21): Unidimensionality of the Arabic version among Egyptian drug users

Eigen-value (ordinal)

DASS-21

DASS-17

Eigenvalue from data

Mean of eigenvalues from parallel analysis

Upper 95th percentile of eigenvalues from parallel analysis

Eigenvalue from data

Mean of eigenvalues from parallel analysis

Upper 95th percentile of eigenvalues from parallel analysis

1

6.481885

1.749607

1.885814

5.936713

1.641377

1.773705

2

1.649158

1.605690

1.698623

1.488974

1.501426

1.593724

3

1.410058

1.500823

1.583175

1.216837

1.399425

1.473555

4

1.260653

1.413044

1.485973

1.059093

1.313195

1.378735

5

1.119023

1.335737

1.403358

.899059

1.231813

1.295945

6

.992901

1.262905

1.323083

.816808

1.161452

1.221044

7

.833116

1.196825

1.249184

.790260

1.091419

1.146133

8

.809966

1.131749

1.181814

.672332

1.030028

1.083310

9

.777705

1.071375

1.121637

.650681

.968717

1.019322

10

.700479

1.013694

1.062786

.554570

.909520

.956514

11

.638598

.958786

1.007664

.525140

.851179

.896220

12

.619486

.905441

.953616

.486496

.796644

.845344

13

.576101

.853279

.899062

.440222

.738543

.789120

14

.514772

.802496

.846184

.422979

.682736

.733027

15

.471494

.751827

.796540

.379766

.627046

.679819

16

.449180

.703096

.748118

.377949

.564222

.618043

17

.405748

.653701

.700077

.282120

.491258

.551740

18

.362971

.604337

.652196

   

19

.339571

.552494

.599426

   

20

.313168

.497956

.547386

   

21

.273967

.435139

.491612

   
  1. DASS Depression Anxiety Stress Scale
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