1 Department of Public Health, Erasmus MC, The Netherlands.
2 Statistics Denmark, Copenhagen, Denmark.
3 Department of Social Sciences, Turin University, Italy.
4 Department of Public health and Microbiology, Turin University, Italy.
5 Medical Statistics, Office for National Statistics, London, UK.
6 SU-KI Centre for Health Equity Studies, Stockholm University, Sweden.
7 Department of Sociology, University of Helsinki, Finland.
Prof. Dr JP Mackenbach, Erasmus MC, Department of Public Health, PO Box 1738, 3000 DR Rotterdam, The Netherlands. E-mail: j.mackenbach{at}erasmusmc.nl
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Abstract |
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Methods We collected data on mortality by educational level and occupational class among men and women from national longitudinal studies in Finland, Sweden, Norway, Denmark, England/Wales, and Italy (Turin), and analysed age-standardized death rates in two recent time periods (19811985 and 19911995), both total mortality and by cause of death. For simplicity, we report on inequalities in mortality between two broad socioeconomic groups (high and low educational level, non-manual and manual occupations).
Results Relative inequalities in total mortality have increased in all six countries, but absolute differences in total mortality were fairly stable, with the exception of Finland where an increase occurred. In most countries, mortality from cardiovascular diseases declined proportionally faster in the upper socioeconomic groups. The exception is Italy (Turin) where the reverse occurred. In all countries with the exception of Italy (Turin), changes in cardiovascular disease mortality contributed about half of the widening relative gap for total mortality. Other causes also made important contributions to the widening gap in total mortality. For these causes, widening inequalities were sometimes due to increasing mortality rates in the lower socioeconomic groups. We found rising rates of mortality from lung cancer, breast cancer, respiratory disease, gastrointestinal disease, and injuries among men and/or women in lower socioeconomic groups in several countries.
Conclusions Reducing socioeconomic inequalities in mortality in Western Europe critically depends upon speeding up mortality declines from cardiovascular diseases in lower socioeconomic groups, and countering mortality increases from several other causes of death in lower socioeconomic groups.
In all countries with available data, mortality has been shown to be higher among those in less-advantaged socioeconomic positions, regardless of whether socioeconomic position is indicated by educational level, occupational class, or income level. Several studies have shown that these mortality differences widened in many countries during the 1970s and the 1980s.19 Until now changes into the 1990s have been documented for a few countries only. For example, studies from Finland, England & Wales, and Sweden observed a widening of relative inequalities in mortality by occupational class.14
The explanation of widening inequalities in mortality is only partly known. One factor that has certainly contributed to widening inequalities in total mortality, at least in some countries, is faster mortality decline from cardiovascular diseases, particularly ischaemic heart disease, in the higher socioeconomic groups.10 Because countries differ in the cause-of-death composition of the mortality excess in lower socioeconomic groups,11 it is unknown, however, to what extent this is a generalized phenomenon. Also, the contribution of other causes of death has been studied less extensively.110
The purpose of this paper is to analyse recent trends in socioeconomic inequalities in mortality in a range of European countries. The analysis focused on the extent to which widening inequalities in mortality were driven by faster mortality decline from cardiovascular diseases in higher socioeconomic groups, and what the contribution of other causes of death was.
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Data and Methods |
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secondary. In every country, the proportion of the population in the highest educational level is higher among men than among women, and increases over time for both men and women.
Data on occupational class of men were available for Finland, Sweden, Norway, Denmark, England & Wales, and Italy (Turin). Age was measured at the start of each subperiod. Data are analysed for men in the age group 3059 years. Men >60 years had to be excluded because of lack of detailed occupational information on retired men in most studies. Women had to be excluded from analysis because it was impossible for many countries to assign women to occupational classes (on the basis of their own occupation or their partners occupation) in a way that was both valid and comparable over time.
Four broad occupational classes were distinguished: non-manual workers, manual workers, farmers and farm labourers, and self-employed men. The Erikson-Goldthorpe-Portocarero (EGP) scheme was used as a reference.14 We report here on differences in mortality between non-manual and manual workers outside the agricultural sector (all self-employed excluded). In all countries, the non-manual and manual classes are the largest two classes, and the share of the manual class decreases over time, while the share of the non-manual class increases.
The occupational class of all men was determined on the basis of the occupation that they had at the time of the population census. For some men, however, information was lacking on their current occupation. This especially applies to men who were economically inactive at the time of the census. In these cases, their occupational class was, as far as possible, determined on the basis of information on a previously held occupation. This information could be obtained in some countries (especially Finland and England & Wales) by linkage to a previous population census.
Despite these efforts, the proportion of men with unknown class was considerable in some countries, and ranged between 1% in Finland and 10% in one of the two time-periods in Sweden and Denmark. The mortality levels of these men are relatively high, due to the fact that most of the men with unknown occupational class are economically inactive men, such as retired or work-disabled men. Unfortunately, their exclusion from analysis is likely to lead to an underestimation of the magnitude of mortality differences between occupational classes, because these men not only have high mortality rates but in addition most of them originate from lower occupational classes.15 However, an adjustment procedure to correct for this underestimation was used which has been shown to provide less-biased estimates of mortality differences between occupational classes.15
Appendix Table 2 provides the International Classification of Disease codes for the causes of death distinguished in the analysis reported in this paper.16
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Methods |
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In order to determine the contribution of changes in cardiovascular mortality to changing inequalities in total mortality we compared the observed rate ratios (RR) for total mortality in 19811985 and 19911995 with an RR for total mortality in 19911995 as it would have been, if neither the proportion of all deaths due to cardiovascular disease, nor the RR of dying from cardiovascular diseases had changed between 19811985 and 19911995. This expected RR for 19911995 was calculated on the basis of (1) the 19811985 proportions of total mortality due to four main groups of causes of death (cardiovascular diseases, neoplasms, other diseases, injuries), (2) the 19811985 RR of dying from cardiovascular diseases, and (3) the 19911995 RR of dying from neoplasms, and other diseases and injuries.
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Results |
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In several cases, these widening inequalities for other causes of death were due to increasing rates of mortality in lower socioeconomic groups. We found rising rates of mortality from lung cancer, breast cancer, respiratory disease, gastrointestinal disease, and injuries among men and/or women in lower socioeconomic groups in several countries. Table 4 illustrates the changes occurring in mortality from these causes among women with high and low educational levels. For lung cancer, rates of mortality have increased among women in all four countries represented in this Table, with stronger increases among women with low levels of education in Finland, Norway, and Denmark. Women with low levels of education sometimes also have rising rates of mortality from breast cancer (Finland), gastrointestinal diseases (Finland, Denmark), respiratory diseases (Norway, Denmark), and injuries (Finland). Italy (Turin) is again the exception, with mostly decreasing rates of mortality among women with low levels of education.
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Discussion |
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Data problems
Comparisons between countries may be hampered by differences in data collection and in data classification. This paper, however, did not intend to quantitatively compare countries: the focus is on changes over time for which we found rather consistent results in the countries represented in this study.
The classification of the population into the broad educational and occupational groups distinguished in our study has not changed between the 1980s and 1990s. What has changed, however, is the proportion of the population in the lower socioeconomic groups: this has generally become smaller, and it is possible that in 19911995 the lower educational and occupational groups represent a more extreme group than in 19811985, in terms of (relative) socioeconomic position and associated material, behavioural, and psychosocial characteristics. In an additional analysis we have looked at changes between the 1980s and 1990s in inequalities in mortality measured with the Relative Index of Inequality, which adjusts for changes in population share of socioeconomic groups.17 In this analysis we found similar results to those reported in this paper on the basis of the simpler RR: relative inequalities in mortality have widened in all countries participating in this study.18
Our analysis is based on a robust distinction between a few broad socioeconomic groups. This may have obscured differences within these broad groups, and the question arises whether similar trends would have been observed had a finer distinction been made. This point could be evaluated with more detailed data on mortality by occupational class from England & Wales. Changes over time in the manual/non-manual RR, as reported in this paper, could be compared with trends in the ratio of mortality of social class IV/V (semi- and unskilled workers) to social class I/II (professional and managerial workers). In the first case, the RR increased from 1.36 to 1.51, whereas in the second case the RR increased from 1.61 to 1.80, reflecting a similar change in relative excess mortality in the lower socioeconomic groups.
The educational and occupational data do not cover the same age range: educational mortality data in most countries are available until (at least) the age of 74, but for occupational class men 60 years had to be excluded from the analyses (see Data and Methods). In order to cover as large a part as possible of deaths as they relate to socioeconomic factors, we decided not to harmonize the age ranges of the analyses. However, this implies that a direct comparison between the results for education and occupation may be subject to bias. In order to see what the effect of age range restriction is, we did an additional analysis in which we restricted the data on mortality by educational level to the age group 3059 years. As expected, in this younger age range absolute inequalities in mortality are smaller, but relative inequalities larger than in the original analyses. The pattern of changes over time, however, is largely identical. While absolute differences in total mortality by educational level were fairly stable, relative inequalities have increased in the age group 3059 as they did in the age group 3074 years, mainly due to faster mortality declines in the higher educational groups. Also, changes in cardiovascular disease mortality contribute importantly to the widening gap in total mortality (results not shown).
Comparison with previous studies
Widening inequalities in mortality in the period covered by this study have been reported before for Finland, Sweden, and England & Wales.14 What this study adds are two other Nordic countries, Norway and Denmark, and a Mediterranean country (Italy [Turin]).
While declines in mortality by occupational class among men in Norway appear to be quite similar to those in Sweden, Denmark presents a slightly different picture, with less favourable mortality trends in manual and non-manual groups. Both in Norway and Denmark, mortality trends among women are generally less favourable than among men, with stagnating mortality among low educated women. Among Danish men with low education total mortality has slightly increased. This shows that the favourable impression given by the Swedish trends in mortality by occupational class among men cannot be generalized to other Scandinavian countries, and perhaps not even to Swedish women.
Although Turin cannot be seen to be representative of Italy as a whole, let alone other southern European countries for which longitudinal mortality data are generally lacking, it does present an interesting contrast to the other countries represented in this study. In this southern European city relative inequalities in mortality show a slight tendency to increase as they do in England & Wales and the Nordic countries, but this is not due to faster declines in mortality from cardiovascular diseases in the upper socioeconomic groups. On the contrary: if anything, cardiovascular disease declines faster in lower socioeconomic groups in Turin. Again, this shows the lack of generalizability of this type of finding from one part of Europe to the other.
While the international (English language) literature on trends in inequalities in mortality is dominated by reports from England & Wales, the latter are put into perspective by the results of our overview. The widening of the gap in total mortality in England & Wales has not been stronger than elsewhere, and appears to be an expression of developments that are shared with other northern European countries.
Implications
Faster proportional declines of mortality from cardiovascular diseases in the upper socioeconomic groups may be due to faster (proportional) changes in various proximate determinants of cardiovascular disease, such as health-related behaviours (smoking, diet, exercise, ...) or health care interventions (hypertension detection and treatment, thrombolytic therapy, ...).3,19 The similarity between the developments in England & Wales and the Nordic countries on the one hand, and the dissimilarity with the developments in Italy (Turin) on the other hand, suggest that changes in health-related behaviours are an important part of the explanation. It has been shown before that there are important differences between northern and southern Europe in the social patterning of behaviours like smoking and diet.20,21 For example, over the past decades smoking prevalence has declined faster in upper than in lower socioeconomic groups in northern Europe, resulting in strong socioeconomic gradients in smoking. In some parts of southern Europe smoking is still more prevalent in upper socioeconomic groups, particularly among women.21
Some of the cause-specific rises in mortality observed in lower socioeconomic groups also suggest an important role of health-related behaviours. Rising rates of mortality from lung cancer and respiratory disease probably point to the (delayed) effects of rising smoking prevalences in lower socioeconomic groups. Rising rates of breast cancer mortality among low educated women, as observed in Finland, may be due to changes in reproductive behaviour.22 The common determinant of rising rates of mortality from gastrointestinal diseases (which include liver cirrhosis as an important component) and injuries may be an increase in excessive alcohol consumption.23
While these behavioural risk factors may be implicated as proximate determinants, this social patterning of behaviour in turn is likely to be due to underlying structural factors like material disadvantage, unfavourable psychosocial conditions, or lack of access to behaviour change support.24,25 Changing these behaviour patterns will therefore require much more than health education. Innovative approaches that combine individual behaviour change support with environmental interventions to remove barriers for healthy behaviour need to be developed.
In conclusion, reducing socioeconomic inequalities in mortality in Western Europe critically depends upon speeding up mortality declines from cardiovascular diseases in lower socioeconomic groups, and countering mortality increases from several other causes of death (lung cancer, breast cancer, respiratory diseases, gastrointestinal diseases, injuries) in lower socioeconomic groups.
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Acknowledgments |
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References |
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