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Open Access Research article

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

Margalida Gili12*, Juan V Luciano245, Natalia Bauzá12, Jaume Aguado245, María J Serrano12, Silvia Armengol3 and Miquel Roca12

Author Affiliations

1 Institut Universitari d'Investigació en Ciències de la Salut (IUNICS), University of Balearic Islands, Cra. de Valldemossa (km 7,5), Palma de Mallorca (07122), Spain

2 Red de Actividades Preventivas y Promoción de la Salud en Atención Primaria (RediAPP), Av. Gran Via de les Corts Catalanes, 587 Ático, Barcelona (08007), Spain

3 Almirall Medical Department, General Mitre 151, Barcelona (08022), Spain

4 Unitat de Recerca i Desenvolupament, Parc Sanitari Sant Joan de Déu, Doctor Antoni Pujadas 42, Sant Boi de LLobregat, Barcelona (08830), Spain

5 Institut d'Investigació en Atenció Primària Jordi Gol (IDIAP), Grup de Recerca en l'Atenció Primària i Salut Mental (GRAPISAM), Av. Gran Via de les Corts Catalanes, 587 Ático, Barcelona (08007), Spain

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BMC Medical Research Methodology 2011, 11:131  doi:10.1186/1471-2288-11-131

Published: 21 September 2011

Abstract

Background

Due to the high prevalence of depression, it is clinically relevant to improve the early identification and assessment of depressive episodes. The main objective of the present study was to examine the psychometric properties of the IDS-SR30 (Self-rated Inventory of Depressive Symptomatology) in a large Spanish sample of depressive patients.

Methods

This prospective, naturalistic, multicenter, nationwide epidemiological study conducted in Spain included 1595 adult patients (65.3% females) with a DSM-IV Major Depressive Disorder (MDD. IDS-SR30 and the Hamilton Depression Rating Scale (HDRS, 21 items)were administered to the sample. Data was collected during 2 routine visits. The second assessment was carried out after 10 ± 2 weeks after first assessment.

Results

The IDS-SR30 showed good internal consistency (α = 0.94) and high item total correlations (≥ 0.50) were found in 70% of the items. The convergent validity was 0.85. Results of the principal component analysis (PCA) and confirmatory factor analyses (CFA) showed that a three factor model (labelled mood/cognition, anxiety/somatic and sleep) is adequate for the current sample.

Conclusions

The Spanish version of the IDS-SR30 seems a reliable, valid and useful tool for measuring depression symptomatology in Spanish population.