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

Table 2 Results of exploratory factor analysis of the DASS-21 and the DASS-17 (extraction by maximum likelihood)

Item number	Loadings of 3-factors solution^a			Loadings of 1-factor solution, DASS-21	Loadings of 1-factor solution, DASS-17
Item number	Factor 1	Factor 2	Factor 3	Loadings of 1-factor solution, DASS-21	Loadings of 1-factor solution, DASS-17
1	.535	−.046	−.057	.531	.528
2	.312	−.182	.307	.317
3	.454	.580	−.207	.439	.447
4	.624	.037	.155	.639	.626
5	.505	.164	.228	.525	.510
6	.351	.090	.245	.363
7	.452	−.346	.255	.452	.429
8	.461	.078	−.139	.456	.440
9	.501	−.265	.093	.494	.491
10	.606	.260	.057	.614	.617
11	.508	.018	.359	.529	.503
12	.616	−.029	.286	.632	.624
13	.619	.173	−.035	.623	.640
14	.312	−.004	.200	.320
15	.540	−.153	.087	.539	.540
16	.508	.242	.065	.515	.524
17	.608	.144	−.187	.598	.614
18	.364	−.042	.126	.368
19	.559	−.156	−.037	.554	.546
20	.656	−.400	−.362	.583	.590
21	.733	.065	−.170	.710	.706

DASS Depression Anxiety Stress Scale, ^aOblimin rotation with Kaiser normalization. After that oblique rotation, the correlations among the three factors were as follows: r(F1,F2) = −0.31, r(F1,F3) = −0.28, and r(F2,F3) = 0.56

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