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Gross Domestic Product and Health Expenditure Growth in Balkan and East European Countries—Three-Decade Horizon

Background: Dynamics of health care has changed over time along with development of the countries themselves. The aim of the study is to compare macroeconomic and health expenditure indicators of interest, such as total health expenditure (THE) as percentage of global domestic product, global domestic product per capita in US$, and private households' out-of-pocket payments of Balkan and Eastern European countries on health, as well as to assess their progress over the observed period. Methods: This research report represents a descriptive data analysis of indicators extracted from the European Health for All database. The data were analyzed using a linear trend and regression analysis to estimate the timeline changes. Results: Greece and Slovenia have the largest median values of global domestic product per capita throughout the whole period, and the largest increment trend was in Lithuania. Median value in out-of-pocket payment of THE was the highest in Albania and Ukraine, while the largest decrease in trend was noticed in Albania and Bosnia and Herzegovina. Bosnia and Herzegovina and Greece had the largest median value of THE as percentage of Gross Domestic Product (GDP) in the observed period, while regression trend analysis showed that Serbia had the largest increase. Most of the countries showed a significant correlation between observed indicators. Conclusion: Trends in the economy must be constantly monitored due to the fact that the population is aging and non-communicable diseases are multiplying, which requires innovations in medical treatment and pharmaceutical development.


BACKGROUND
The health system must be adequately funded or "the holes will lead to a rapid sinking" (1). There are a lot of suggested options in order to increase funding, such as increment in Gross Domestic Product (GDP) investments, better organization of resource allocation in health, introducing taxes on harmful products, insurance options, etc. (1). Better communication between health policymakers and controllers of public spending would result in more sustainable system that covers the most or all of citizen health care needs. Many changes affect countries, whether they are richer or poorer. Poor countries face challenges to organize affordable and sufficient quality health services, while richer countries struggle with aging populations. Both need to keep health expenditures under control, while they are rising a lot (2,3).
By the method of health system funding, European countries can be sorted into three groups. The first group would present the countries with the Beveridge model of funding based mostly on taxation. This model is found in Great Britain, Spain, and New Zealand (4). The second group with the Bismark model rely their health funds on social insurance. This model is represented in Germany, France, Belgium, the Netherlands, Japan, and Switzerland (5). The third group of countries with the Semashko model bases their health funds on health care provided by the government for its citizens (6). The last one is characteristic for Russia and most other post-communist countries as well as in the most of the Southeastern countries and Balkan countries. Since they have a common past, they really look like each other in terms of forming good health systems, which means that they look up to the Russian Federation as a country that has set up such a system (7). This health system undertook some changes and transitioned into the social insurance or mixed social insurance/taxation-based system (8,9). The former Yugoslavia had this kind of combined health system, while many Eastern European countries (the Russian Federation, Latvia, and Estonia) adopted this system during the 1990s. Changes always lead to certain problems, mainly through increased expenditures and increased labor costs. This has further led to one of the most regressive forms of payment for health services, and that is direct payment by the patient causing further conflicts: inequality between rich and poor (10,11).
Therefore, adaptations of health systems began, which certainly could not be universal, because different countries had different levels of development. Universal health coverage became the ultimate goal for each country but, so far, none of them fully succeed. Some of them had better ideas, but adaptation varied, mostly dependent on the decisions and policies of the government. Economic analysis and comparison studies become the most relevant tools for accessing the health situation. The results of these studies proved to be very important in decision making concerning health investments, but a lot of aspects must be covered and many other factors need to be considered for outcomes to lead to universal coverage of health costs (12).
Abbreviations: GDP, gross domestic product; OOP, out-of-pocket spending; THE, total health expenditure; HFA, Health for All.
Communicable, non-communicable diseases, aging population, new medical interventions and medications, gender inequalities, different level of country development, economic investments, and many other factors need to be considered (13).
Total health care spending increased during the 1960s and 1970s, slowed in the 1980s, and rose again in 1990s. This upward trend has continued, but the average percentage increase in gross domestic product (GDP) varied. The largest was in Romania and Estonia, from an average of 5 to 11% of GDP. As the GDP for health increased, the public health spending followed that rise accordingly. In the mid-1980s, this trend slowed down, and in the late 1990s and 2000s, it reached on average 6%. In the most EU countries, it varied between 12 and 15% in 2010 (14). Many researches show the significant correlation between higher spending on health in the countries that invest higher percentage of GDP per capita in comparison to the lower-income countries (15)(16)(17)(18).
The well-known trend of health care systems in Central and Eastern European countries of using private budgets to cover medical expenses is in particular caused by health policy aiming to reduce the burden of the health problems of patients. Therefore, the form of full or partial payments for some medicines is used (19). In 2004, OOP payments accounted for 73-98% of total private health expenditures, and those payments mostly included dentists, laboratory tests, private treatments, etc. Expenditures of inpatient care and medicine and outpatient care are on the trend rise in Belarus, Estonia, and Hungary, and those difficulties will affect the people with lower socioeconomic status, resulting in delayed or unutilized health care needs (20).
Because of similar history and, also, the similar health system between these countries, we conducted a short data report to investigate the progress of selected economic indicators and to find a possible relationship between them. By doing this, we have obtained data concerning health financing of these countries that have similar development levels. By observing positive trends and analyzing their progress, it looks like that countries with less success in health system financing are more likely to adopt patterns of government investments, in comparison to more developed countries.
The aim of this study was to compare the total health expenditure (THE) as percentage of GDP, GDP per capita in US$, and private households' out-of-pocket payments on health as percentage of THE between Balkan and East European countries. The progress over the period between 1990 and 2014 was assessed.

METHODS
This research report article represents a descriptive data analysis of macroeconomic and health expenditure indicators, extracted from European Health for All database (HFA-DB) (21). This database provides indicators for 53 countries and 153 health indicators. Member States of the WHO European Region have been reporting essential health-related statistics to the Health for All (HFA) family of databases since the mid-1980s, making it one of the oldest sources of data of WHO. As it is based on reported data, the HFA family of databases is also particularly valuable.
Indicator of interest-THE as percentage of GDP, GDP per capita in US$, and private households' out-of-pocket payments on health as percentage of THE were extracted from the database. It included the following Balkan and Southeastern European countries: Albania, Bulgaria, Bosnia and Herzegovina, Belarus, Greece, Croatia, North Macedonia, Montenegro, Romania, the Russian Federation, Serbia, Slovenia, Turkey, Estonia, Lithuania, Latvia, and Ukraine. Observation period was from 1990 to 2014.
The data will be analyzed using a linear trend estimate. It is a statistical technique that helps interpret data where a series of process measurements are treated as a time series, a trend estimate used to make and justify statements of tendencies in the data, linking the measurements to the times in which they occurred. Linear trend estimation will show the occurrence of possible patterns in the behavior of the variables over the observed time period and will provide information on whether the trend developed is positive, negative, or even absent. Trend results will be presented in tabular form. Linear trend and regression analysis were used to access the timeline changes in observed indicators for each country and to calculate the progress of these countries over time. Median operation and interquartile range 25th-75th percentile were used for better comparison of each country. Financial parameters are expressed in US currency.
The data were also analyzed using the statistical program SPSS version 20. Pearson's coefficient of correlation was used to determine the relationship between each group of indicators of interest. Statistically significant results had a p value of <0.01.
The data are anonymous and do not belong to individual citizens. Therefore, there is no question of protecting the privacy of the data. According to the International Ethical Guidelines for Biomedical Research involving Humans and Good Clinical Practice Guidelines, a study like this does not require consideration by the Ethics Committee; https://cioms.ch/wp-content/uploads/2017/01/WEB-CIOMS-EthicalGuidelines.pdf; https://www.ema.europa.eu/en/documents/scientificguideline/guideline-good-clinical-practice-e6r2-4-step-2b_en.pdf.
Greece and Slovenia have the largest median values of GDP, US$ per capita throughout that period. This indicator for Greece was US$17,976 and that for Slovenia was US$19,726, while the smallest numbers were recorded in Ukraine (US$1570) and Albania (US$2110). Looking at the regression analysis, all countries showed increase over the observed time, with the biggest increase in Lithuania (y = 714.22x -2791.9; R² = 0.9373) and Bosnia and Herzegovina (y = 233.86x -743.15; R² = 0.9367) ( Table 1 and Graph 1).
Pearson's correlation indicated that from 17 considered countries ( Table 2)

DISCUSSION
In the period from 1880 to 1990, data on the OECD countries showed similar rising paths in investing of GDP on health, with  France being in the leading spot (22). Looking at the OECD countries nowadays, which are high-income countries, it can be noticed that they spend a large percentage of GDP on health. The United States is the country that spends the highest percentage of all countries in the OECD group, with almost 17% in 2018 (23). Comparing Balkan and East European Countries with the OECD group, it can be concluded that, first of all, they do not belong to the same income group, so one can expect that THE as % of GDP is much lower for these countries. However, Serbia is the country with the highest investment of all of these countries, with 10.37% in 2014. On the other hand, a larger share of GDP does not necessarily indicate the existence of a better health care system. The United States spends more on health care due to higher prices of health services, and not because of the greater use of those services (24). Unfortunately, more than 80% of people living in lowand middle-income countries have benefited from only 20% of global health spending (25). The World Health Organization has divided countries into six regions according to what part of GDP is invested in health. Among them, the European region invested the most in the monitoring period, from 2000 to 2017, with 7.8% in the last considered year (26). Countries that were analyzed in our research belong to the European region.
In 2014, the global average level of GDP percentage spent on health was 6.1%, while the average value of all countries considered in our research for the same year was 7.2%, higher than the global average (26). From all of the European countries, Switzerland had the highest investments (12.3%), while Turkey (4.2%), Romania (5.25%), and Latvia and Lithuania (both 6.3%) had the lowest ones in 2017 (27,28). Romania (5.25%) and Turkey (5.35%) had the lowest median percentage of GDP investments in health within the 17-year follow-up period, which is in line with previous research presenting these two countries as the ones with slowest growth (29). Similar results were found in Eurostat analysis, where Romania had the lowest investment of GDP in health, roughly 5%.
Governments provide an average of 51% of a health spending of countries, while more than 35% of health spending per country comes from out-of-pocket expenses (30). On the average, in 2015, 32% of health expenditure was out-of-pocket (31). More than half of countries in our analysis showed increase of OOP spending, with the highest percentage in the Russian Federation in which the OOP increased 2.7 times in 2014 in comparison to 1995. On the contrary, in Bosnia and Herzegovina, there was a decrease of 2.3 times in the analyzed period. Out-of-pocket share of health expenditure in 2016 was the highest in Switzerland, accounting for 30% (32).
Our results showed that more than half of the analyzed countries have OOP percent share higher than 30%, with Albania on the top with 50%, followed by Ukraine and Russia accounting for 46%. They are in line with the database "Our world in data" with these three countries as the ones with the highest OOP share, along with Bulgaria (33). Slovenia (11.8%) and Croatia (13.5%) showed the smallest percentage, similar to the United States.
The GDP per capita in the United States was recorded at the amount of US$53,356 in 2017 (34). Compared to any country in our analysis, the United States has far higher health spending that is almost twice as high as Slovenia's costs (US$23,594), and these costs are higher than in all other countries in our study.
Slovenia, in 2018, according to data from World Bank, had spending equal to US$26,234, ranking 36th. Estonia (US$22,928) and Greece (US$20,324) were listed as 41st and 42nd, respectively, while Croatia was 57th (US$14,869) (35). Looking at the data from our study, countries with the highest spending were Slovenia (US$23,594) on top, followed by Estonia (US$19,705) and Greece (US$18,613). Countries that had the least health spending were Ukraine (US$2640) and Albania (US$4538)-nine and five times smaller than Slovenia, respectively.
Out-of-pocket expenditures are also positively correlated with the GDP share spent on health. The OOP budget share is higher in countries that spend a large share of their GDP on health and lower in countries that channel more of their total health spending through social health insurance (36). Those results are in line with our findings where higher spending on GDP led to higher share of OOP spending in nine observed countries.
THEs rise along with the development of the country. Such development allows access to new pharmaceuticals, medical technology, and also a new point of view, in general. However,   (40,41). Our analysis pointed out that Balkan and Southeastern countries have also shown an increased trend concerning per capita spending, with Slovenia and Greece at the top.
It is well known that OOP payment prevents some people from accessing needed care, while others face financial hardship when they access services. In 2000, percentage of OOP spending on health in the world was around 19, and in 2014, it decreased to about 18% (42). Our study considering Balkan and Southeastern countries showed that Albania, Ukraine, and the Russian Federation had greater difference from the world's average (average of percentage of OOP spending on health worldwide in 2014 was 18%).
The problem of population aging is one of the worrying problems in all countries where medical costs are rising, and such is the situation in the Balkans and Eastern Europe (43). Older people have more needs related to medicine and health systems that do not include these age groups adequately and will adversely affect both national and private budgets that need to cover that (44,45). This problem is realistic, since older people suffer from more than one non-communicable disease or should be subjected to more than one surgical intervention accompanied by necessary laboratory analyses (46,47). Also, the home care should not be forgotten, since this kind of health care is usually provided by family members (out-of-pocket expenditures) (48,49).
Health systems are influenced by epidemiological transition and health financing, which affect the type of services needed. Health care expenditures are rising fast, faster than the global economy, becoming a huge global concern especially in the lowand middle-income countries (50,51). WHO report on Universal Health Coverage issued on 2016 indicates that the world has spent almost 10% of GDP on health with an average per capita expenditure of US$1000.
More than 70% of health care costs relate to outpatient and inpatient treatment, medications, and medical supplies, which limits other types of care, such as prevention services or health administration services (52, 53). Recent findings about global burden of diseases and risk factors for them can be of large help in decision making concerning health expenditure rise and health investments (54,55). These facts should be available for as much country as it is possible, especially concerning their economic level of development.
Health economy becomes of strong importance in the public health area, or even in the field of national policy. The results of studies in the field of economics, thanks to what they provide, can influence important decisions, such as the level of investment in health care, as part of GDP, and can help to solve existing problems in a better way (56,57). Comparing the results with countries that have a similar health care system can help prevent the emergence of similar problems that are observed in those countries (58,59). Increasing number of health care policymakers and managers has enabled health economics to become a tool for making allocation of resources more rational (60,61).

CONCLUSIONS
Our study compared macroeconomic and health expenditure indicators of interest between selected Balkan and Eastern European countries in the period from 1995 to 2014. The results show that Greece and Slovenia have the largest median values of GDP per capita throughout the whole period and the largest increment trend was in Lithuania. The median value in OOP payment of THE was the highest in Albania and Ukraine, while the largest decrease in trend was noticed in Albania and Bosnia and Herzegovina. Bosnia and Herzegovina and Greece had the largest median value of THE as percentage of GDP in the observed period, while regression trend analysis showed that Serbia had the largest increase. Most of the countries showed a significant correlation between the observed indicators.

DATA AVAILABILITY STATEMENT
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.