Does the pharmacy expenditure of patients always correspond with their morbidity burden? Exploring new approaches in the interpretation of pharmacy expenditure

BMC Public Health

Research Article

Amaia Calderón-Larrañaga¹  Beatriz Poblador-Plou¹  Alexandra Prados-Torres¹  Anselmo López-Cabañas¹  Daniel Bordonaba-Bosque¹  José María Abad-Díez²  José Tomás Alcalá-Nalvaiz³ 

[1] Aragon Health Sciences Institute (I + CS), Zaragoza, Spain;Aragon Health Sciences Institute (I + CS), Zaragoza, Spain;Department of Health and Consumer Affairs, D.G. Planning and Assurance, Government of Aragon, Zaragoza, Spain;Department of Statistical Methods, Science Faculty, University of Zaragoza, Zaragoza, Spain;

关键词: Primary Health Care;    Standardise Residual;    Primary Health Care Centre;    RESID Method;    Outlier Group;   

DOI  :  10.1186/1471-2458-10-244

 received in 2009-07-07, accepted in 2010-05-11,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundThe computerisation of primary health care (PHC) records offers the opportunity to focus on pharmacy expenditure from the perspective of the morbidity of individuals. The objective of the present study was to analyse the behaviour of pharmacy expenditure within different morbidity groups. We paid special attention to the identification of individuals who had higher values of pharmacy expenditure than their morbidity would otherwise suggest (i.e. outliers).MethodsObservational study consisting of 75,574 patients seen at PHC centres in Zaragoza, Spain, at least once in 2005. Demographic and disease variables were analysed (ACG® 8.1), together with a response variable that we termed 'total pharmacy expenditure per patient'. Outlier patients were identified based on boxplot methods, adjusted boxplot for asymmetric distributions, and by analysing standardised residuals of tobit regression models.ResultsThe pharmacy expenditure of up to 7% of attendees in the studied PHC centres during one year exceeded expectations given their morbidity burden. This group of patients was responsible for up to 24% of the total annual pharmacy expenditure. There was a significantly higher number of outlier patients within the low-morbidity band which matched up with the higher variation coefficient observed in this group (3.2 vs. 2.0 and 1.3 in the moderate- and high-morbidity bands, respectively).ConclusionsWith appropriate validation, the methodologies of the present study could be incorporated in the routine monitoring of the prescribing profile of general practitioners. This could not only enable evaluation of their performance, but also target groups of outlier patients and foster analyses of the causes of unusually high pharmacy expenditures among them. This interpretation of pharmacy expenditure gives new clues for the efficiency in utilisation of healthcare resources, and could be complementary to management interventions focused on individuals with a high morbidity burden.

【 授权许可】

CC BY   
© Calderón-Larrañaga et al; licensee BioMed Central Ltd. 2010