Patterns of pharmaceutical use for immigrants to Spain and Norway: a comparative study of prescription databases in two European countries

Background: Although equity in health care is theoretically a cornerstone in Western societies, several studies show that services do not always provide equitable care for immigrants. Differences in pharmaceutical consumption between immigrants and natives are explained by variances in predisposing factors, enabling factors and needs across populations, and can be used as a proxy of disparities in health care use. By comparing the relative differences in pharmacological use between natives and immigrants from the same four countries of origin living in Spain and Norway respectively, this article presents a new approach to the study of inequity in health care. Methods: All purchased drug prescriptions classified according to the Anatomical Therapeutic Chemical (ATC) system in Aragon (Spain) and Norway for a total of 5 million natives and nearly 100,000 immigrants for one calendar year were included in this cross-sectional study. Age and gender adjusted relative purchase rates for immigrants from Poland, China, Colombia and Morocco compared to native populations in each of the host countries were calculated. Direct standardisation was performed based on the 2009 population structure of the OECD countries. Results: Overall, a significantly lower proportion of immigrants in Aragon (Spain) and Norway purchased pharmacological drugs compared to natives. Patterns of use across the different immigrant groups were consistent in both host countries, despite potential disparities between the Spanish and Norwegian health care systems. Immigrants from Morocco showed the highest drug use rates in relation to natives, especially for antidepressants, “pain killers” and drugs for peptic ulcer. Immigrants from China and Poland showed the lowest use rates, while Colombians where more similar to host countries. Conclusions: The similarities found between the two European countries in relation to immigrants’ pharmaceutical use disregarding their host country emphasises the need to consider specific immigrant-related features when planning and providing healthcare services to this part of the population. These results somehow remove the focus on inequity as the main reason to explain differences in purchase between immigrants and natives