© 2003 American Public Health Association
James Y. Nazroo is with the Department of Epidemiology and Public Health, University College London, England. Correspondence: Requests for reprints should be sent to James Y. Nazroo, PhD, Department of Epidemiology and Public Health, University College London, 1-19 Torrington Pl, London WC1E 6BT, England (e-mail: j.nazroo{at}public-health.ucl.ac.uk).
Differences in health across ethnic groups have been documented in the United States and the United Kingdom. The extent to which socioeconomic inequalities underlie such differences remains contested, with many instead focusing on cultural or genetic explanations. In both the United States and the United Kingdom, data limitations have greatly hampered investigations of ethnic inequalities in health. Perhaps foremost of these is the inadequate measurement of ethnicity, but also important is the lack of good data on socioeconomic position, particularly data that address life-course issues. Other elements of social disadvantage, particularly experiences of racism, are also neglected. The author reviews existing evidence and presents new evidence to suggest that social and economic inequalities, underpinned by racism, are fundamental causes of ethnic inequalities in health.
Differences in health across ethnic groups, in terms of both morbidity and mortality, have been repeatedly documented in both the United States19 and the United Kingdom.1016 In the United States, non-Hispanic Blacks and Native Americans are reported to have higher rates of mortality than do non-Hispanic Whites, though these decrease at older ages, while Hispanic people and Asian/Pacific Islanders have lower rates of mortality than non-Hispanic Whites. This suggests considerable heterogeneity in experience across ethnic/racial groups, with some minority groups doing well, others doing badly, and the differences possibly varying across the life course. In the United Kingdom, although mortality data are not available by ethnic group, the data on immigrant mortality rates and morbidity again suggest heterogeneity of experience across minority groups. For most outcomes, Bangladeshi and Pakistani people report the poorest health, followed by Caribbean people and then Indian people, with Chinese and White people having the best health. Although there is now substantial data describing differences across ethnic groups, the factors underlying such differences, in particular the role that socioeconomic inequalities may play, remain contested. While in 1845 Engels attributed the poor health and mortality record of Irish people living in England to their poor social circumstances,17 and in 1916 Trask concluded that lower death rates among Whites than Blacks in the United States reflected more favorable social circumstances rather than any inherent differences,18 the role that socioeconomic position may play remains the subject of considerable debate. Some claim that socioeconomic inequalities make a minimal or no contribution to ethnic inequalities in health,19 others suggest that even if they do contribute, the cultural and genetic elements of ethnicity must also play a role,20 and others argue that ethnic inequalities in health are predominantly determined by socioeconomic inequalities.21,22 Given the growing empirical and theoretical sophistication of work on ethnic inequalities in health, it is worrying that crude explanations based on cultural stereotypes and claims of genetic difference persist,2325 despite a lack of concrete evidence, more than 100 years of research exposing the limitations of the assumptions underlying such explanations,26 and growing evidence that the obvious social and economic inequalities faced by ethnic minority groups are likely to be a fundamental explanation.5,7,15,2729 In the United Kingdom there has, of course, been a long tradition of investigating socioeconomic inequalities in health. However, in the main this work has not been drawn upon by those investigating ethnic inequalities in health, perhaps as a consequence of Marmot and colleagues now classic study of immigrant mortality rates.10 Published shortly after the Black Report had firmly placed inequalities in health on the research agenda,30 this study used a combination of British census and death certificate data to explore the relationship between country of birth and mortality rates. A central finding was that there was no relationship between occupational class and mortality for immigrant groups, even though there was a clear relationship for those born in the United Kingdom. These findings led to the conclusion that differences in socioeconomic position could not explain the higher mortality rates found in some migrant groups in the United Kingdom.10 It was not until 1997 that socioeconomic position reappeared in published national data exploring the relationship between ethnicity and health in the United Kingdom.12,13 But again, conclusions drawn from analysis of immigrant mortality data did not appear to support a socioeconomic explanation,12 although those on morbidity did.13 In the United States, there is also a long tradition of investigating ethnic/racial disparities in health; indeed, and in contrast with the situation in the United Kingdom, in recent decades there has been greater interest in health differences according to "race" than in socioeconomic differentials in health. This is partly due to the limited data on socioeconomic position available in routine US health statistics and the use of race as a surrogate for poverty in many analyses.1 Implicit in this approach is the mistaken assumption that ethnic minority groups in the United States are uniformly disadvantaged and therefore that socioeconomic differentials in health status within ethnic minority groups do not need to be considered. Indeed, until recently there have been few examinations of the socioeconomic stratification of health within ethnic minority groups in the United States.3,8,31 On the other hand, the contribution of socioeconomic factors to, in particular, BlackWhite health differentials in the United States has been investigated in many studies.2,3,7,32,33 These studies have, however, often been limited by small sample sizes or a reliance on administrative data in which information on factors other than ethnicity and socioeconomic position was not available. In fact, in both the United States and the United Kingdom, data limitations have greatly hampered investigations of ethnic inequalities in health and how they might be structured by social and economic disadvantages, particularly as obvious data limitations are often ignored by investigators. Perhaps the main limitation is the inadequate measurement of ethnicity in many studies, with the heterogeneity of ethnic groups ignored, observer-assigned ethnicity used instead of self-reported ethnicity, and surrogates such as country of birth used instead of ethnic origin. Also important is the lack of good, or any, data on current socioeconomic position in health studies, let alone data that can deal with changes over the life course and other elements of social disadvantage, such as inequalities related to geography and experiences of racial discrimination and harassment.34 This article illustrates the impact of some of these limitations on how data are interpreted and suggests that social and economic inequalities are fundamental causes of ethnic inequalities in health. It also suggests that an adequate understanding of racism is fundamental to understanding ethnic inequalities in health.
It is now reasonably clear that a socioeconomic patterning of health is present within ethnic groups in industrialized countries. Analysis of the US Multiple Risk Factor Intervention Trial (MRFIT) data7 showed that all-cause mortality rates over its 16-year follow-up period had a very clear relationship to mean income in the area of residence of respondents for both Black and White men (individual socioeconomic data were not included in the study, so income data from the 1980 US Census were used to determine median family income of White and Black households in the area of residence of the individual). Mortality rates increased with decreasing income, resulting in a twofold difference in mortality rates between those in the top annual income band ($27 500 or higher) and those in the bottom annual income band (less than $10 000) for both Black and White men.7
Figure 1
Important here is that both sets of data point to heterogeneity within broad ethnic groupings. It is misleading, for example, to consider that Black Americans are uniformly disadvantaged in terms of their health; those in better socioeconomic positions have better health. There is nothing inevitable, or inherent, in the link between being Black American or Bangladeshi, for example, and a greater risk of mortality and morbidity.
If socioeconomic position is related to health within groups, it seems probable that inequalities in socioeconomic position might be related to ethnic inequalities in health. Figure 2
Additional evidence of the importance of socioeconomic inequality is provided by Figure 3
Overall, then, the impression is that across ethnic groups, across countries, and across outcomes, socioeconomic factors contribute to ethnic inequalities in health. However, these data also raise the possibility that socioeconomic inequalities cannot fully explain ethnic inequalities in health. For most groups and for most outcomes, differences remain once the adjustment for the socioeconomic indicator has been made. It is important to recognize here that the process of standardizing for socioeconomic position when making comparisons across groups, particularly ethnic groups, is not so straightforward. As Kaufman and colleagues point out,37,38 the process of standardization is effectively an attempt to deal with the nonrandom nature of samples used in cross-sectional population studies. Controlling for relevant "extraneous" explanatory factors introduces the appearance of randomization. But this assumes that all necessary factors are accounted for by the measures available, and that particular measures do not contain any residual confounding. Evidence from the Fourth National Survey of Ethnic Minorities clearly illustrates the fallacy in the latter point. In that survey, analysis of ethnic differences in income within class groups showed that within each class group, ethnic minority people had a smaller income than White people.13 Indeed, for the poorest groupPakistani and Bangladeshi peopledifferences were twofold and equivalent in size to the difference between the top and bottom class groups in the White population. A similar pattern existed for other indicators of socioeconomic position in the Fourth National Survey of Ethnic Minorities, and similar findings have been reported in the United States.28,39 For example, Oliver and Shapiro report that within occupational groups, White people have higher incomes than Black people; among those below the poverty line, Black people are more likely to remain in this situation than White people; and within income strata, Black people have considerably lower wealth levels than White people and are less likely to be home owners.40 The implication of this is clear; using either single or crude indicators of socioeconomic position is of little use for "controlling out" the impact of socioeconomic position. Within any given level of a particular socioeconomic measure, the social circumstances of ethnic minority people in the United Kingdom and the United States are less favorable than those of White people. This leads to 2 related problems with approaches that attempt to adjust for socioeconomic effects when making comparisons across ethnic groups. First, if socioeconomic position is simply regarded as a confounding factor that needs to be controlled out to reveal the "true" relationship between ethnicity and health, data will be presented and interpreted once controls have been applied. This will result in the impact of socioeconomic factors becoming obscured, and their explanatory role in determining the health of ethnic minority people will be lost. The second problem is that the presentation of "standardized" data allows the problems with such data13,3638 to be ignored, leaving both the author and reader to assume that all that is left is an "ethnic/race" effect, be that cultural or genetic.
Nevertheless, if these cautions are considered, there are some benefits in attempting to control for socioeconomic effects. In particular, if controlling for socioeconomic effects alters the pattern of ethnic inequalities in health, despite the limitations of the indicators used, we can conclude that at least some of the differences we have uncovered are a result of a socioeconomic effect. Figures 2 and 3
There is growing evidence that socioeconomic conditions across the life course can influence current health.41 This could occur in 2 ways. First, an early "exposure," perhaps prenatal42 or in early childhood, might set an adverse biological process in train. For example, low birthweight, which is strongly influenced by adverse material circumstances acting over the lifetime of the mother, is associated with high rates of diabetes, coronary heart disease, respiratory disease, and hypertension in adult life. Similarly, short stature, influenced by nutrition in early life, is related to an increased risk of respiratory and cardiovascular mortality.41 Second, the impact of socioeconomic disadvantage on health might accumulate across the life course, a process that has been referred to as "weathering" with respect to the health of Black women in the United States.43 Evidence from the Fourth National Survey of Ethnic Minorities suggests that ethnic inequalities in health in the United Kingdom increase with age, with relatively small differences at younger ages and larger differences emerging from the mid-30s onwards.15 Variations in ethnic inequalities in health across the life course are also apparent in US data, but these take the opposite form, with an apparent narrowing of differences at old ages (there has been much discussion of possible "cross-over" effects for BlackWhite differences and how far these might be an artifact of the data).44,45 The interpretation of the contrasting UK and US patterning of ethnic inequalities in health with age is not straightforward, but such data do point to the need for sophisticated approaches to the explanation of ethnic inequality that takes account of life-course issues. In particular, we need to place ethnic inequalities in health within a wide social context. For example, the increasing ethnic inequalities in health with age in the United Kingdom could reflect a number of coexisting explanations, including accumulation of risks over the life course and the long-term consequences of exposure to hazards in early life. In the UK context, the cross-sectional pattern of increasing differences in risk over age could also reflect differences between first- and second-generation migrants, since older people are first-generation migrants and younger people second-generation migrants. This final point is a reminder of the need to be aware of a number of potential effects related to migration.
Experiences of and awareness of racism appear to be central to the lives of ethnic minority people, and there is growing evidence that these contribute to ethnic inequalities in health. Eighty percent of Black respondents in a US study reported experiencing racial discrimination at some time in their lives.27 Findings from the UK Fourth National Survey of Ethnic Minorities suggested widespread experiences of racial harassment and discrimination among ethnic minority people in the United Kingdom: more than 1 in 8 respondents reported having experienced at least one incident of harassment over the preceding year47; among ethnic minority respondents, there was a widespread belief that employers discriminated against ethnic minority job applicants and widespread experience of such discrimination48; among White people, 1 in 5 said that they were racially prejudiced against Caribbean people and 1 in 4 said they were racially prejudiced against Asian people.47 Indeed, qualitative investigations of experiences of racial harassment and discrimination in the United Kingdom have found that for many people experiences of interpersonal racism are a part of everyday life, that the way they lead their lives is constrained by fear of racial harassment, and that being made to feel different is routine and expected.49,50
Experiences of racial harassment and discrimination appear to be related to health in the few studies that have been conducted. US studies have shown a relationship between self-reported experiences of racial harassment and a range of health outcomes, including hypertension, psychological distress, poorer self-rated health, and days spent unwell in bed; they have also found that differences in rates of hypertension between Black and White respondents were substantially reduced by taking into account reported experiences of, and responses to, racial harassment.5,27,51,52 In the United Kingdom, analyses of the Fourth National Survey of Ethnic Minorities also suggested a relationship between experiences of racial harassment, perceptions of racial discrimination, and a range of health outcomes across ethnic groups.29,53 Table 1
In both the United States and the United Kingdom, there remain ongoing problems with the data available to explore ethnic inequalities in health. Data often do not contain sufficiently detailed information on the ethnicity of respondents to reflect heterogeneity across ethnic groups and heterogeneity within broadly defined ethnic groups. Socioeconomic data are either not collected at all or are collected at very crude levels that are plainly inadequate for drawing comparisons across ethnic groups. Those that are collected invariably reflect current position rather than risks across the life course, and they do not include other dimensions of social inequality, such as experiences of racial harassment and discrimination and geographically based inequalities. Nevertheless, a large body of convincing evidence now supports the possibility that ethnic inequalities in health are largely a consequence of socioeconomic differentials. This applies in both the United States and the United Kingdom, across a range of ethnic minority groups and outcomes. There is also a growing body of evidence from both countries suggesting that experiences of racial harassment and discrimination, and perceptions of living in a discriminatory society, contribute to ethnic inequalities in health. These findings, however, need to be placed within a wider explanatory framework. There are 2 routes, not mutually exclusive, that can be followed. First, these findings could be investigated in terms of how they relate to the individual embodiment of social risks. How do such markers of social inequality relate to psychological and biological markers of stress, and how does this translate into disease outcomes? Here, the emphasis is on the causal pathways linking "exposures" to social and economic inequality with disease outcomes. Importantly, the processes involved might vary across ethnic groups, given differences in social context and suggested genetic variations across ethnic groups. For example, from an epidemiological perspective it might be fruitful to explore how social inequality translates into hypertension-related diseases for Black American people in the United States and Black Caribbean people in the United Kingdom but into cardiovascular disease for Pakistani and Bangladeshi people in the United Kingdom. However, such an approach avoids more fundamental explanations for the health, economic, and social inequalities related to ethnicity. Second, therefore, it is important to consider the centrality of racism to any attempt to explain ethnic inequalities in health. Not only are personal experiences of racism and harassment likely to influence health, but racism as a social force will play a central role in structuring the social and economic disadvantage faced by ethnic minority groups. The socioeconomic differences between ethnic groups should not be considered as somehow autonomous (which is a danger of an approach that attempts to examine the extent to which socioeconomic differentials "explain" ethnic differentials in health). As Oliver and Shapiro demonstrate,40 the socioeconomic disadvantage of Black people in the United States is the outcome of a long history of institutional racism and discrimination that has produced the current levels of disadvantage. Similarly, while the postwar migration of ethnic minority people into the United Kingdom was driven by a shortage of labor, this process and the socioeconomic disadvantage faced by ethnic minority migrants was, and continues to be, structured by a racism that has its roots in colonial history.54,55 It is worth carefully considering the motives for undertaking work on inequalities in health. These motives seem to be related to competing desires to expose the extent and consequences of wider social inequalities and to uncover etiologic processes, and I have argued elsewhere that this focus on etiologic processes has great potential for racializing inequalities in health.56 For studies of inequalities in health to contribute to our understanding of etiology, we need a tight focus on the pathways that lead from social and economic disadvantage to poor health, particularly if we are to meet the requirement that social causes of inequalities in health must be biologically plausible. There is no reason why such pathways should be identical for different health outcomes or for different dimensions of social and economic inequality. However, such a focus on pathways produces an exclusive concern with inequalities in health as an adverse outcome, and how the complex pathways leading to this outcome can be understood and broken. The root cause, wider social inequalities, becomes obscured from view. The policy implications of this are clear: the more difficult and dramatic interventions to address social inequalities can continue to be avoided and public health can focus on improving our understanding of pathways and designing interventions along them. Inequalities in health become a problem requiring technical interventions tailored to individual diseases and individual circumstances; they become a problem for individuals rather than a reflection of social malaise. Williams and colleagues comments in this regard are worth citing: There is a temptation to focus on identified risk factors as the focal point for intervention efforts. In contrast, we indicate that the macrosocial factors and racism are the basic causes of racial differences in health. The risk factors and resources are the surface causes, the current intervening mechanisms. These may change, but as long as the basic causes remain operative, the modification of surface causes alone will only lead to the emergence of new intervening mechanisms to maintain the same outcome.28(p36) However, understanding how the macrosocial factors indicated by Williams and colleagues operate and designing appropriate policy interventions are by no means straightforward. Certainly, there is a need to recognize the overriding importance of national and historical context on the "making" of ethnic groups, how this is related to economic processes and inequities in economic position, and how this influences the lives of ethnic minority and migrant populations and the disadvantages that they face. Racism can be considered to be fundamentally involved in the structuring of economic, social, and health opportunities for ethnic minority people. At an institutional level, it is clear that discrimination influences the economic opportunities that people have, as well as the quality of health and social services that they receive. In addition, historically racism has fundamentally structured the construction of ethnic minority groups and patterns of migration at both an international level (when, why, and where to) and a national level (which locations, which industries). For example, Fenton,57 building on Eriksens work,58 has distinguished 5 types of ethnic-making or migration situations:
While this typology might not be comprehensive, it does point to the different contexts within which ethnicity or race becomes mobilized to form distinct groupings. Implicit is that the differing processes listed will lead to different forms of racialization, of subsequent disadvantage, and to different historical trajectories for the groups concerned. Understanding the process and the context within which it occurs should aid in understanding disadvantage and how it might develop. Understanding how they are related to future trajectories for ethnic minority groups (across generations and cohorts) and individuals (over time) is important to any understanding of ethnic difference, including ethnic inequalities in health, and appropriate policy responses.
The author acknowledges the support of NHS Executive London.
The views expressed are those of the author and do not necessarily reflect those of National Health Service (NHS) Executive London. Accepted for publication October 8, 2002.
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