Psychometric properties of the IDS-SR30 for the assessment of depressive symptoms in spanish population

Table 3 Results of a principal component analysis in the first assessment dataset (n = 1595)

IDS-SR Items	Component			Rush et al (1996)^a	Wardenaar et al (2010)^b
	1. Mood/cognition	2. Anxiety/somatic	3. Sleep
1. Initial insomnia	0.47	0.46	0.64	3	3
2. Middle insomnia	0.53	0.48	0.66	3	3
3. Early morning awakening	0.58	0.39	0.55	3	3
4. Sleeping to much	0.06	0.12	-0.64	3	3
5. Feeling sad	0.81	0.46	0.38	1	1
6. Feeling irritable	0.42	0.63	0.30	2	1
7. Feeling anxious or tense	0.49	0.71	0.39	2	1
8. Reactivity of mood	0.81	0.44	0.33	1	1
9. Diurnal variation of mood	0.30	0.24	0.16	-	-
10. Quality of mood	0.71	0.36	0.32	1	1
11+12. Appetite disturbance	0.59	0.46	0.07	1	2
13+14. Weight disturbance	0.53	0.40	0.07	1	2
15. Concentration/decision-making	0.78	0.47	0.29	2	1
16. Self criticism and blame	0.72	0.48	0.22	1	1
17. Future pessimism	0.78	0.49	0.29	1	1
18. Suicidal thoughts	0.64	0.50	0.21	1	1
19. Interest in people/activities	0.84	0.46	0.31	1	1
20. Energy/fatigability	0.81	0.49	0.26	1	1
21. Pleasure or enjoyment (not sex)	0.83	0.41	0.27	1	1
22. Interest in sex	0.69	0.36	0.28	1	1
23. Psychomotor retardation	0.74	0.43	0.23	2	1
24. Psychomotor agitation	0.33	0.69	0.32	2	1/2
25. Aches and pains	0.44	0.59	0.07	2	2
26. Sympathetic arousal	0.43	0.73	0.22	2	2
27. Panic/phobic symptoms	0.28	0.63	0.04	2	2
28. Constipation/diarrhoea	0.33	0.52	0.00	2	2
29. Interpersonal sensitivity	0.55	0.52	0.09	2	1
30. Leaden paralysis/Physical energy	0.69	0.54	0.13	2	1/2
Eigenvalue (in real data)	10.89	1.75	1.33
Eigenvalue (randomly generated)	1.25	1.22	1.19

Factor loadings and eigenvalues.
Note: IDS-SR = Inventory of Depressive Symptomatology Self Report. Boldface indicates the primary loading for each item.
^a Components on which each item had its highest loading in PCA results by Rush et al (1996). An underlined number indicates that the item loads on a different component in this study.
^b Components on which each item had its highest loading in PCA results by Wardenaar et al (2010). An underlined number indicates that the item loads on a different component in this study.

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