Mayoral, José MaríaAlonso Caballero, JordiGarin Boronat, Olatz, 1979-Herrador, ZaidaAstray, JenaroBaricot, MaretvaCastilla, JesúsCantón, RafaelCastro, AdyDelgado Rodríguez, MiguelFerri, AliciaGodoy i García, PereGonzález Candela, FernandoMartín, VicentePumarola, TomásQuintana, José MaríaSoldevila, NúriaTramames, SoniaDomínguez García, ÀngelaCIBERESP Cases and Controls in Pandemic Influenza Working Group2015-04-142015-04-142013Mayoral JM, Alonso J, Garin O, Herrador Z, Astray J, Baricot M et al. Social factors related to the clinical severity of influenza cases in Spain during the A (H1N1) 2009 virus pandemic. BMC Public Health. 2013; 13: 118. DOI 10.1186/1471-2458-13-1181471-2458http://hdl.handle.net/10230/23415Background: During the 2009 influenza pandemic, a change in the type of patients most often affected by influenza was observed. The objective of this study was to assess the role of individual and social determinants in hospitalizations due to influenza A (H1N1) 2009 infection. Methods: We studied hospitalized patients (cases) and outpatients (controls) with confirmed influenza A (H1N1) 2009 infection. A standardized questionnaire was used to collect data. Variables that might be related to the hospitalization of influenza cases were compared by estimation of the odds ratio (OR) and 95% confidence intervals (CI) and the variables entered into binomial logistic regression models. Results: Hospitalization due to pandemic A (H1N1) 2009 influenza virus infections was associated with non-Caucasian ethnicity (OR: 2.18, 95% CI 1.17 − 4.08), overcrowding (OR: 2.84, 95% CI 1.20 − 6.72), comorbidity and the lack of previous preventive information (OR: 2.69, 95% CI: 1.50 − 4.83). Secondary or higher education was associated with a lower risk of hospitalization (OR 0.56, 95% CI: 0.36 − 0.87). Conclusions: In addition to individual factors such as comorbidity, other factors such as educational level, ethnicity or overcrowding were associated with hospitalization due to A (H1N1) 2009 influenza virus infections.application/pdfeng© Mayoral JM, Alonso J, Garin O, Herrador Z, Astray J, Baricot M et al. Creative Commons Attribution License http://creativecommons.org/licenses/by/2.0/Grip A (H1N1)Malalties transmissiblesSocial factors related to the clinical severity of influenza cases in Spain during the A (H1N1) 2009 virus pandemicinfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1186/1471-2458-13-118Influenza A (H1N1) 2009PandemicHospitalizationSocial factorsinfo:eu-repo/semantics/openAccess