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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