In Western societies two factors affecting population health patterns are nationality of birth1 and immigration across national borders.2 While comprehensive data are available for the first aspect,1,3 complete and reliable information for immigrants is available only for those complying with the registration requirements of the host Country.4 The same is true for natives who, for different reasons, do not beneficiate of the National Health Service (NHS). Measuring the amount and type of drugs distributed by charitable organisations to people not assisted by the NHS, can be the only way to obtain a proxy of their health pattern, as previously reported.5 This method is particularly useful when a definite correlation exists between a given drug (or a group of drugs) and a specific disease. Its main limitation is yelding an overview picture that cannot be splitted down to individual patients. However, this appears to be the only available tool to get an insight into the helth status of such peculiar population, a point that appears to have a growing importance in order to implement appropriate, patient oriented and effective public health policies. In the present study on 87,550 subjects of this type, we present the complete data of one year, in conjunction with preliminary demographic data. Moreover we make some preliminary observations on potential seasonal variatons in drug dispensation, an issue that could deserve further investigation, in the perspective of suitale preventive interventions.
Design and methods
The data in this retrospective study, collected in the period January-December 2014, were obtained from the Banco Farmaceutico (BF), an Italian Non Governative Organisation which supplies medicines to over 1500 centres distributed throughout the entire national territory and curing people not assisted by our NHS. The study population, representative of the entire population cared for by the BF, is described according to gender, macro-region of birth, age distribution (three groups: ≤17, 18-64, and ≥65 years) and duration of the presenting illness (acute vs chronic). As we have already done in a previous study5 the dispensed drugs were grouped according to the anatomical therapeutic chemical (ATC) classification and their quantities calculated using their daily defined dose (DDD), both methods widely established at the international level to measure drug utilisation. The ATC classification is a taxonomic method based on the classification of drugs according to the organs or systems on which they act and their chemical, pharmacological and therapeutic properties. The DDD is a technical unit of measure representing the daily maintenance dose in adults, relatively to the main therapeutic indication of the drug. It is therefore a standard unit and not the recommended dose for the individual patient, which may vary according to many other factors, such as age, genetic determinants, presence of co-morbidity, multiple drug treatments, etc. For each ATC category, the quantity of drug dispensed was expressed as DDD/1000 patients/day, thus obtaining a synthetic overview of the therapeutic needs of the entire population. Statistical analysis was performed using either parametric or non parametric tests as appropriate.
In Table 1 it is shown that drugs for the respiratory tract are globally the more dispensed. They are followed by those for the cardiovascular system and those for the gastrointestinal tract and antibiotics. We found also significant seasonal variations in the dispensation of medicines (data not shown). We analysed this phenomenon for the most commonly dispensed drugs (i.e. those for the respiratory system) and we found a statistically significant difference (P<0.001) for the seasonal distribution, with a peak in the coldest months and a minimum in the summer. A seasonal difference existed also for cardiovasculr and gastrointestinal drugs, with a dispensation peak in autumn (data not shown).
The characteristics of the population are shown in Table 2. The majority is constituted by immigrants, though Italians account for approximately one fifth. Adult males are the more represented. Patients usually seek the help of charitable drug dispensing centres for acute problems, but a significant percentage of subjects with chronic diseases is also present.
Discussion and Conclusions
In countries having a NHS or other forms of widespread health insurance, population health patterns are well known and constantly updated. This is the case also in our Country.1,3 The same is true as well for immigrants who comply with national regulations, becoming therefore beneficiaires of NHS services. Complete data on their health patterns and requirements are made available by local and national sanitary institutions.4 Unfortunately there is a part of the population that escapes this kind of assessment. This is constituted of a majority of migrants from other European (EU) and non EU countries in conjunction with a minority of natives who are either drop-outs or too poor to afford participation in NHS or health insurance expense participation.6 For this population few data are available in literature, in spite of the growth of information for legal immigrants in recent years. This information seems to point to significant health pattern differences for immigrants according to their countries of origin,7 though other factors play an important role too.8
A first attempt to investigate the health patterns and requirements of the population usually escaping official health surveys could be through the pharmacoepidemiological data of the drug dispensing charities. This method, endorsed by the World Health Organisation, yelds information on daily DDDs every 1000 subjects and appears to be suitable for this type of studies, as already demonstrated in a preliminary report.5 Despite the limitation of this method, some conclusions can drawn from our data. First, it is clear that some ATC classes are sharply more represented: these are, in the order, respiratory, cardiovascular and gastro-intestinal drugs. This is only in part concordant with the distribution seen in the Italian native population, in which cardiovascular diseases rank first and the specific medicines are the more prescribed,3 while legal immigrants consume more medicines for the gastrointestinal tract, followed by non steroidal antinflammatory drugs.4 Other studies have found different distributions of disease patterns in immigrant population, but the data are sometimes divergent. For example some authors have found a significant prevalence of cardiovascular diseases, especially hypertension,9 while others have even observed a decreased risk of cardiovascular events.10 The latter data are more in agreement with our observations, though they do not mention the impact of respiratory diseases. These, in our population seem to represent an important problem, especially in the coldest months of the year, while the dispensation of other medicines, e.g. those for the cardiovascular system, seem to follow a different pattern. At the moment we have no explanation for this and we are trying to obtain more detailed information. Finally, as reported by others4 we have found that that chronicity is a growing problem among immigrants, and it increases with increasing age.
In conclusion, the data of this preliminary study indicate that this particular population, so difficult to analyse because of its peculiarities that make it virtually invisible to the common methods of investigation, shows significant differences as compared to Italian citizens and foreign residents. This, on one hand, indicates that it is necessary to plan ad hoc interventions to take charge of their health needs, on the other hand it underlines the necessity of further studies on single drug-disease associations.