Postwar Mortality Trends in Bosnia and Herzegovina Stefania Girone - Sara Grubanov-Bošković 1. Introductory notes There is a very small number of researches that have as their object of analysis the recent mortality trends in Bosnia and Herzegovina and the existing ones mainly aim at estimating the number of war-related deaths (Mann, 1994; Obermeyer et al, 2008; Zwiezchowski and Tabeau, 2010). Consequently, the main features in the issue of mortality in postwar Bosnia and Herzegovina are generally little known, especially in regard to the gaps between its two coexisting entities: Federation of Bosnia and Herzegovina and Republika Srpska. With an aim of filling, at least partially, this gap we intend to analyze this phenomenon in order to provide, in spite of limited data availability, a comprehensive picture – and foremost a comparative one – by constructing the abridged life tables for the entire country and at least one of its two entities. 2. Research Subject, Quality of Statistical Data and Methodology 2.1. Area of Reference The Dayton Agreements signed in November 1995, by marking the end of the Jugoslav war, recognized for the first time the existence of two precisely defined and distinct entities within Bosnia and Herzegovina: a) Federation of Bosnia and Herzegovina (FBH), whose majority is composed of Bosniacs (Muslims) and Croats; b) Republika Srpska, with its Serbian majority. In the light of this, the territorial references of our research will be: a) The entire Former Jugoslavia, articulated on the basis of territorial partition in force until 1991 (see Figure 1); b) Bosnia and Herzegovina, on the ground of its current territorial division (see Figure 2)1. Faculty of Political Science, University of Catania (Italy) – [email protected] Faculty of Political Science, University of Bari (Italy) – [email protected] 1 The territorial partition of the State comprises two entities, Federation of Bosnia and Herzegovina and Republika Srpska, plus the Brčko District that was officially constituted in 2000 as an autonomous administrative unit under sovereignty of Bosnia and Herzegovina and formally belonging to both of Bosnian entities. 1 Fig. 1 – Bosnia and Herzegovina within the area of Former Jugoslavia. Fig. 2 – Territorial division of Bosnia and Herzegovina. According to the 2010 mid-year estimates, the entire Bosnian population amounts 3,846thousand units, out of which the majority (60.78%) living in the 2 FBH (see Table 1). In the period under observation, covering a time range marked not only by war events but also by the beginning of the demographic post-transitional stage, the total population recorded a considerable decrease equal to 12.1% of the initial amount. Tab. 1 – Territory under reference. Area Bosnia and Herzegovina Federation Bosnia and Herzeg. Republika Srpska Brčko District Area (sqm) 51209,2 26110,5 24605,7 493 Population Census Estimates (31-3-1991) (30-6-2010) a.v. % a.v. % 4377033 100.00 3846372 100.00 2720074 62.14 2337660 60.78 1569332 35.85 1433038 37.26 87627 2.00 75674 1.97 Source: Agency for Statistics of Bosnia and Herzegovina, Federal Office of Statistics of Federation Bosnia and Herzegovina, Republika Srpska Institute of Statistics, 2012. Without any doubt, during the war operations (1992-1995) public health – considered in the broad sense of the term as availability and/or quality of food, water, fuel/energy, health services and personal security – was, in the reference to large share of population, extremely precarious (Mann, 1994). Could have all of that left lasting effects on the life expectancy of the Bosnian population that might be traced even fifteen years after the war’s end? 2.2. Quality of Statistical Data The major obstacles in analyzing, with a sufficient accuracy, the current demographic assets of the country are related mainly to the difficulties of data collection. These difficulties are determined by the fact that the last census in Bosnia and Herzegovina was conducted in the distant 1991 and that since then no other census was taken. Meanwhile, the war events have caused massive population displacements and have altered the mortality levels2, which makes clear that, at present, the ’91 census has more of a historic relevance and thus cannot be used as a reference to a “normal” evolution of population. 2 As for that matter, it should be noted that some authors have estimated that the number of warrelated deaths in the period 1992-1995 reached 89,186 units (Cfr.: Zwiezchowski and Tabeau, 2010). While, on the basis of the UNHCR data, it has been estimated that the number of refugees and IDPs reached 1,290 thousand units only in two years period 1993-1994 (Hovy, 2011). 3 Therefore obtaining data, largely estimates, that are fully reliable for a population – composed of three major ethnic groups3 (Bosniacs, Croats and Serbs) – which underwent a series of dramatic historical and political events might have significant implications of statistical-demographic nature too. In fact, the three different statistical institutions operating in the country – Agency of Statistics of Bosnia and Herzegovina (at national level), Federal Office of Statistics of the FBH and Republika Srpska Institute of Statistics – do not publish life tables of any kind4 neither do provide the complete sex and age structure estimates of these populations for the public use. Nevertheless, following the preparations for the next census, to be held in 2013, we managed to obtain from each statistical institute, in front of repeated specific requests, complete official estimates on sex and age structure of populations living in each one of the two entities (FBH and Republika Srpska) for 2009 and 2010. In course of data elaboration, we have retained as appropriate to proceed with the construction of abridged life tables (2009-10) for the entire country and – given the low numbers of deaths distributed by sex and five-year age groups of Republika Srpska – for the sole entity of FBH. This approach should still allow us to formulate valuations on the general as well as specific mortality, both at national level and at the level of its two distinct entities, since the demographic characteristics of Republika Srpska are complementary to those of FBH and obtainable, thus, as its “difference”. 2.3. Construction of Abridged Life Table In constructing the life tables we proceeded, firstly, with computing agespecific death rates by means of: , [1] where the meaning of symbols is evident. The respective age-specific death rates have been reported in Table 2. 3 The Constitution of Bosnia and Herzegovina (set out in Annex IV of Dayton Agreement) defines Bosniacs, Croats and Serbians (along with Others) as country’s constitutive peoples, whereas the term Bosniac substitutes the usage of old “ethnical” term “Muslim”. 4 Officially, the Agency for Statistics of Bosnia and Herzegovina and the Federal Office of Statistics of FBH, do not dispose of life tables and, hence, do not provide them for external use. Nevertheless, it does not exclude the possibility that they do elaborate life tables for their internal usage. 4 Tab. 2 – Age-specific death rates (in ‰), 2009-10. Age 0-4 5-9 10-14 15-19 20-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 80-84 85+ Total Bosnia and Herzegovina FBH Male Female Male Female 1.62 0.14 0.10 0.34 0.68 0.94 0.98 1.44 2.05 3.80 7.39 13.74 18.85 23.11 39.42 65.41 118.93 173.96 9.52 1.41 0.07 0.08 0.18 0.24 0.26 0.47 0.59 1.14 1.95 3.63 5.58 9.33 13.44 27.91 51.65 123.32 153.05 8.70 2.04 0.16 0.12 0.53 0.74 0.81 0.77 1.12 2.00 3.60 6.46 10.86 16.44 28.87 44.13 70.89 100.86 163.36 8.83 1.66 0.11 0.12 0.26 0.28 0.28 0.49 0.56 1.23 2.09 3.11 5.34 8.67 18.47 31.26 54.50 95.95 163.29 8.50 Source: Own elaboration of official data provided by Agency of Statistics of Bosnia and Herzegovina and Federal Office of Statistics of Federation of Bosnia and Herzegovina, 2012. Once the crude death rates have been obtained, we computed respective probabilities of dying by applying the well-known equation for converting the values devised by Reed and Merrel5: , 5 [2] Cfr.: R. PRESSAT, 1961. 5 and, then, constructed abridged life tables (Tables 3-6) in which the values of mean expectation of life were calculated by using the following expression: [3] Tab. 3 – Abridged life table, Bosnia and Herzegovina, 2009-10 Age 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85+ lx 100,000 99,191 99,119 99,068 98,899 98,563 98,103 97,625 96,923 95,936 94,129 90,709 84,668 77,024 68,583 56,226 40,368 21,960 Male qx, x+5 0.0081 0.0007 0.0005 0.0017 0.0034 0.0047 0.0049 0.0072 0.0102 0.0188 0.0363 0.0666 0.0903 0.1096 0.1802 0.2820 0.4560 1.0000 ex 73.35 68.93 63.98 59.01 54.11 49.29 44.50 39.71 34.98 30.31 25.85 21.73 18.10 14.65 11.14 8.04 5.22 lx 100,000 99,295 99,262 99,221 99,130 99,013 98,883 98,648 98,359 97,799 96,849 95,104 92,483 88,260 82,510 71,706 55,238 29,366 Female qx, x+5 0.0070 0.0003 0.0004 0.0009 0.0012 0.0013 0.0024 0.0029 0.0057 0.0097 0.0180 0.0276 0.0457 0.0652 0.1309 0.2297 0.4684 1.0000 ex 77.56 73.09 68.11 63.14 58.20 53.26 48.33 43.44 38.56 33.76 29.07 24.56 20.18 16.03 11.97 8.40 5.16 Source: See Table 2. 6 Tab. 4 – Abridged life table, FBH, 2009-10. Age 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85+ lx 100,000 98,984 98,906 98,849 98,585 98,222 97,823 97,445 96,900 95,936 94,223 91,223 86,391 79,550 68,802 55,072 38,442 22,981 Male qx, x+5 0.0102 0.0008 0.0006 0.0027 0.0037 0.0041 0.0039 0.0056 0.0099 0.0179 0.0318 0.0530 0.0792 0.1351 0.1996 0.3020 0.4022 1.0000 ex 73.42 69.14 64.20 59.23 54.38 49.58 44.77 39.93 35.14 30.47 25.98 21.75 17.83 14.15 10.97 8.08 5.49 lx 100,000 99,173 99,116 99,054 98,924 98,783 98,646 98,406 98,131 97,528 96,512 95,024 92,517 88,585 80,743 68,991 52,379 32,122 Female qx, x+5 0.0083 0.0006 0.0006 0.0013 0.0014 0.0014 0.0024 0.0028 0.0061 0.0104 0.0154 0.0264 0.0425 0.0885 0.1455 0.2408 0.3867 1.0000 ex 77.23 72.86 67.90 62.94 58.02 53.10 48.17 43.28 38.39 33.61 28.94 24.35 19.95 15.72 12.01 8.62 5.57 Source: See Table 2. 7 Fig. 3 – – Survival and mean expectation of life functions, Bosnia and Herzegovina, Source: See Tab. 2. Fig. 4 – Survival and mean expectation of life functions, FBH. Source: See Tab. 2. 8 3. Main Features of Recent Mortality Trends in Bosnia and Herzegovina Within the discussion of results deriving from the picture given by the constructed (abridged) life tables, we also made – by “completion” – ,where it was possible, some considerations on Republika Srpska. All these efforts have been done bearing in mind the idea of expanding the analysis of these topics in near future by computing, for example, the cause-of-death life tables6. 3.1. Age Distribution of Mortality According to the results contained in Tables 3-4, in the two-years period 2009/2010 the life expectancy at birth of male Bosnian population reached 73.35 years while the female one reached the age of 77.56 years, values that largely correspond to the estimates released by the UN7 for 2010 (e0 equal to 73 for men and 78 for women). At the same time, the life expectancy at birth in FBH is substantially equal to national values regarding men (e0 = 73.42) and slightly lower for women (e0 = 77.23). Hence, by taking into account the above mentioned differences, it is possible to formulate a hypothesis according to which “by completion” the life expectancy at birth for men of Republika Srpska should be slightly lower than the national value (for Serbs thus, the e0 should be around 73.28 years) while, on other hand, for women it should result somewhat higher (with e0, roughly, equal to 77.8). Observing the values of both probabilities of dying and mean expectation of life at young age groups (0-14 year) and using as basis of comparison the same values for other developed countries (in our case the comparison will be made with the recent Italian experience) reveals that there are still large differences in terms of survival between, on one hand, the Western Europe in general and Italy in particular and, on another, Bosnia and Herzegovina. In Italy, for example, in 2009 the life expectancy at birth has reached 79.01 years for men and 84.13 years for women8 resulting, thus, 5.66 years higher for males and 6.57 years higher for females in comparison to the life expectancy of the Bosnian population. In particular, by comparing the values of probabilities of dying at the 0-4 age group in Bosnia and Herzegovina (q0-4 = 8.09‰ for male 6 For what concerns the main characteristics of different types of cause-of-death life tables cfr., e g.: DI COMITE, Sulla mortalità per causa, “Studi di demografia”, Bari, 1969. 7 UNITED NATIONS, World Population Prospects: The 2010 Revision, New York, 2011 (http://esa.un.org/unpp/) 8 ISTAT, Istituto Nazionale di Statistica, 2011. (http://demo.istat.it/). 9 and 7.05‰ for female) with those reported in Italy (where q0-4 = 4.31‰ for male and 3.66‰ for female), it could be assumed that, in the following years, the further contraction of infant mortality will determine additional gains in terms of life expectancy for the Bosnian population. If we focus, instead, on the data related to the FBH it reveals the presence of higher infant mortality (q0-4 = 10.16‰ for male and 8.27‰ for female) in comparison to national values and, as a consequence, the share of FBH survivors that reaches the following young age-groups is lower than the portion of survivors of Bosnia and Herzegovina. Moreover, in reference to adult age group (15-65 years) the results show that men in Bosnia and Herzegovina enter this age group with a mean expectation of life equal to 59.01 years and leave it with a life expectancy of 14.56 years. On other side, women at the moment of entrance to the adult age claim a life expectancy of 63.14 years and abandon this group with a mean expectation of life equal to 16.03 years. The probabilities of dying for this large age group suggest that the additional mortality reduction in age groups 45-64 for men and 50-64 for women would result in further gains in terms of life expectancy for the population of Bosnia and Herzegovina On the contrary to the values concerning young age groups, the FBH probabilities of dying in adult age groups tend to appear lower than the those obtained at the national level. Finally, regarding the old age groups (65+) the probabilities of dying and respective mean expectations of life have been calculated only up to the 80 years of age, since the estimates on population’s sex and age structure do not consent to quantify correctly the mortality levels at the extreme old age groups. In developed countries, the mortality reduction at young and old age groups has increased the number of individuals who arrive at more advanced ages. It generated, as time passed by, the effect of progressive “rectangularization” of the survival curve – a phenomenon that goes step by step with the increase of the median age at death – and whose existence is clearly evident today both in Bosnia and Herzegovina and FBH (see Figures 3 and 4). The age distribution of deaths has, consequently, moved toward right becoming less variable. If we focus, in particular, at the right side of the graph, i.e. on the old age groups, it shows that 77.02% of men and 88.26% of women succeeded in reaching the age of 65 years. However, the share of survivors at the age of 65 years in Bosnia and Herzegovina appears to be lower than the respective values for Italy where 87.40% of men and 89.47% of women reach the above defined age9. 9 Up to now, we considered the age of 65 years as the threshold-age for defining the “elderly population”. To determine the share of “elderly population” a dynamic criterion can also be applied, i.e. a criterion which is not based on static thresholds but on mobile ones, introducing 10 Worth mentioning is also the gap between Bosnia and Herzegovina and Italy in terms of probabilities of dying: the risk of dying for the sixty-five years old men in Bosnia and Herzegovina is 109.60‰, while for the Italian men it is equal to 75.26‰. Under effect of high probabilities of dying the initial contingent of Bosnian population is reduced in half at the age group 75-79 in case of men and 80-84 in case of women, which represents a difference of 5 years in comparison to Italy. In the light of all the considerations made – and as the same Tables 3-4 and Figures 3-4 suggest – the future increase of life expectancy will derive from a progressive reduction of mortality levels in reference to all age groups, both young and adult as much as at the old ages10. To conclude, the regional differences, more or less marked, in terms of mortality between FBH and the entire country could be, approximately, summed up in the following manner: a) higher infant/juvenile mortality (0-14 years) in FBH; b) probabilities of dying in adult age-groups (15-64) that tend to be lower in FBH; c) the probabilities of dying of old population systematically higher for the FBH. 3.2. Gender Differences in Mortality Although it would be very interesting to expand this study also on determinants – both biological and socio-economic ones11 – of differential mortality among genders, for the reasons of space, we will assign the last part of our research to the analysis of the male supermortality phenomenon that tends to characterize the Bosnian reality, as well as the reality of the rest of Developed world. The index most frequently used, for the purposes of revealing the existence or less of gender differences in mortality, is the difference between the two life expectancies at birth. Precisely, the difference between two life expectancies at birth in Bosnia and Herzegovina is 4.20 years to disadvantage of men, while in FBH the difference, corresponding to 3.82 years, is somewhat lower. In thus the logic of “remaining life expectancy” of 10 years (Cfr.: RYDER, 1975). In the light of this logic we computed, by interpolation, the age corresponding to 10 years of remaining life expectancy which in Bosnia and Herzegovina is equal to 71.84 years of age for men and 72.76 for women, while in the FBH it corresponds to the age of 71.68 years for men and 72.96 for women. 10 Clearly, this is also true for other mortality indicators such as the probable length of life (or median length of life) and normal length of life (or the point of Lexis). 11 As for the determinants and paradoxes linked to the phenomenon of male supermortality cfr., e.g.: SCARDOVI (1961); VALLIN (2002). 11 addition, having in regard that the mortality varies greatly in relation to age and sex, we retain necessary to analyze the differences also in terms of risks of dying at different ages, and for that reason we proceeded with the construction of Figure 512. Fig. 5 – Male supermortality in relation to age. Source: See Table 2. Primary, Figure 5 shows the peak in male supermortality at the age group 25-29 in which the risk of dying for men is 3.5 times higher than in the case of women. This data, however, should be considered having in mind that this age group is generally characterized by low probabilities of dying for both sexes and that mainly violent deaths (caused by car crashes and other accidents) – which are leading causes of death for those aged 15 to 29 – are the one to make the difference. Nevertheless, the most important information that emerges from the above Figure is: a) the particularity of the curve’s trend; b) the fact that 12 The index generally adopted to analyze gender differentials in terms of the risk of dying is the following: [4] , in which the meaning of symbols is evident. 12 male supermortality is, by and large, more emphasized at the national level in comparison to the sole FBH13. 4. Some Final Remarks The construction of (abridged) life tables, not only for Bosnia and Herzegovina but also for one of its two entities (FBH), has allowed us to draw some conclusions on recent and most important features of mortality phenomenon in the country of reference. Firstly, on the basis of our results the life expectancy at birth has reached the age of 73.35 years for men and 77.56 years for women, recording thus an increase of 20.77 years for males and 22.79 for women in comparison to the values of 1952-195414. Moreover, the life expectancy at birth for men in FBH generally corresponds to the values obtained at national level, while it reveals to be slightly lower for the FBH women. However, a thorough analysis concerning the distribution of probabilities of dying and mean expectation of life has pointed out the existence of gaps related to sex as well as to different age groups among two territories under consideration. The overall analysis of recent manifestations of the phenomenon in the reference area has reaffirmed the general concept according to which not all age groups contribute in the same measure to increase the values of life expectancy at birth. To conclude, we wanted to assess the type of implications that mortality reduction and its current assets might have had on the age structure of analyzed populations. Considering that the fertility decline together with the mortality contraction – that converted into a major longevity of populations – have been the generator of the population aging process, we retained important to analyze 13 Regarding the mortality gaps between different ethnic groups (Croats, Muslims and Serbs) cfr., e.g.: COURBAGE (1991). Considering as a very sensitive and difficult issue the definition of the term “ethnic”, especially in the period following the Jugoslav dissolution, as well as the problems deriving from the analysis of data classified under the category “ethnic”, we have decided not to carry on with the research similar to one proposed by Courbage since we believe that, given the current assets in the Bosnian country, the data might not correspond to the real facts. Since, however, the postwar partition of Bosnia and Herzegovina was made considering the presence of ethnic groups on the territory (see par. 2.1) one should have in mind that, implicitly and with lots of precautions, some hypothesis concerning mortality gaps among different ethnic groups might be formulated as well. 14 On the basis of life tables for 1952-1954, elaborated for Bosnia and Herzegovina by (then) Institute of Statistics of Jugoslavia, the life expectancy at birth was 52.58 years for men and 54.77 years for women (cfr. Statistical Yearbook of Jugoslavia, Federal Institute of Statistics of Jugoslavia, 1990). 13 this latter aspect as well. On the basis of life tables elaborated for this occasion we computed the Aging index which represents the ratio between the mean expectation of life at the threshold of old age (λ = 60 and/or λ = 65) and the life expectancy at birth multiplied by the probabilities surviving at the age of λ, that is: . [5] From the results reported in Table 5 arises that the demographic aging process – related to our life tables – has arrived at an advanced stage, by reaching the share of 15.4% for men and 18.2% for women aged 65 years and above in Bosnia and Herzegovina and presenting similar outcomes also in the FBH. On the other side, the aging index appears to be higher by a little more than 5.5 points if we apply the same logic in reference to the population aged 60 years and above. Tab. 5 – Aging index of stationary populations related to life tables. Age (λ) Bosnia and Herzegovina Male 60 years 65 years 20.89 15.38 Female 24.07 18.24 FBH Male 20.98 15.33 Female 23.89 18.03 Source: See Table 2. The picture, however, changes significantly when considering the real populations (see Table 6) since: a) Systematically the age index values are lower than those reported in Table 5; b) Gender gaps appear to be more pronounced, most likely due to different incidence of past war events on mortality and, most probably, on migratory phenomenon too. 14 Tab. 6 – Aging index of populations currently living in Bosnia and Herzegovina and FBH. Age (λ) Bosnia and Herzegovina (30-06-2010) Male Female FBH (31-12-2010) Male Female 60 years 17.89 21.72 15,83 20.03 65 years 13.30 16.80 10,78 14.41 Source: See Table 2. This heterogeneity of these results underlines particularly two aspects: due to further reduction of risk of dying – as well as due to existence of deficitary fertility (i.e. in presence of total fertility rates) below the replacement level (TFR = 2.10) – the population aging in the next years should increase substantially. Moreover, in the following years the local demographic transition processes should contribute to make less irregular sex and age structures of our populations15. In overall, we can retain that our research activity regarding the population of Bosnia and Herzegovina is only at its beginnings and that we intend to expand the study of these topics once the results of the next census, to be held in 2013, are released which would allow us to carry out our analyses by using more satisfying and complete quantifications for two entities composing this country. 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