© 2006 American Public Health Association DOI: 10.2105/AJPH.2005.062752
Noreen Goldman is with the Office of Population Research, Princeton University, Princeton, NJ. Rachel T. Kimbro is a Robert Wood Johnson Health and Society Scholar, the Department of Population Health Sciences, University of Wisconsin, Madison. Cassio M. Turra is with Cedeplar, Universidade Federal de Minas Gerais, Brazil. Anne R. Pebley is with the School of Public Health and Department of Sociology, University of California, Los Angeles. Correspondence: Requests for reprints should be sent to Noreen Goldman, DSc, Office of Population Research, Princeton University, 243 Wallace Hall, Princeton, NJ 08544 (e-mail: ngoldman{at}princeton.edu).
Objectives. We assessed whether the few findings to date suggesting weak relationships between education and health-related variables among Hispanics are indicative of a more widespread pattern. Methods. We used logistic regression models to examine education differentials (i.e., education gradients) in health behaviors and outcomes among White and Mexican-origin adults, adolescents, and infants. We gathered information from 3 data sets: the Los Angeles Family and Neighborhood Survey, the Fragile Families and Child Wellbeing Study, and the National Health Interview Survey. Results. In contrast with patterns for Whites, education was weakly associated or not associated with numerous health-related variables among the US Mexican-origin population. Among adults, Mexican immigrants were especially likely to have weaker education gradients than Whites. Conclusions. The weak relationships between education and health observed among individuals of Mexican origin may have been the result of several complex mechanisms: social gradients in health in Mexico that differ from those in the United States, selective immigration according to health and socioeconomic status, and particular patterns of integration of Mexican immigrants into US society.
Research on ethnic mortality differentials in the United States demonstrates that all-cause mortality rates among Hispanics are as low as or lower than those of the non-Hispanic White population, despite the much lower overall socioeconomic status (SES) of Hispanics.14 In general, Hispanics have a socioeconomic profile comparable to African Americans, and they are even more likely than African Americans to lack health insurance coverage; in addition, their rates of health care service use are low. Nevertheless, Hispanics have considerably higher life expectancies than African Americans.5 This pattern, known as the "Hispanic paradox," also is observed with certain measures of health status and certain health-related behaviors. For example, numerous studies suggest that birthweights are higher and rates of tobacco and alcohol use are lower among Hispanics than among non-Hispanic Whites.68 However, there are large variations in this "paradox" according to national origin and immigrant status, and the paradox is not seen in all groups. For example, Puerto Ricans exhibit the highest mortality rates of any Hispanic groupand higher than those of non-Hispanic Whiteswhereas rates among Mexicans, Central Americans, and South Americans are generally similar to or lower than those of the non-Hispanic White population.2,3,9 In addition, overall mortality risks are significantly lower among Hispanic immigrants than among native-born Hispanics.4,10 Despite extensive research on the Hispanic paradox, a second, probably related, paradox has received less attention. A myriad of studies conducted in the United States and elsewhere have shown that higher SEStypically assessed according to education, income, and occupational statusis strongly associated with lower mortality rates and better health at all levels of the socioeconomic ladder. These "social gradients" have been found in a wide range of populations and time periods and, at least in developed countries, typically characterize both health-related behaviors and health outcomes.1114 However, one exception appears to be the US Hispanic population, for whom education differentials are either weak or nonexistent in the case of numerous health-related variables. Although government reports have sometimes provided SES-specific health status tabulations for Hispanics, few researchers have explicitly analyzed SES differentials. A recent analysis conducted as part of the National Longitudinal Mortality Study provided estimates of life expectancy, according to level of education, family income, and employment status, separately for Hispanics, non-Hispanic Whites, and African Americans. Although the authors did not provide data on any formal comparisons across ethnic categories, the results suggested smaller SES differentials among Hispanic groups than among the other groups assessed.15 Several other studies have revealed weaker gradients among Hispanics than among non-Hispanic Whites, typically for a single variable pertaining to health status or health-related behaviors. For example, relatively weak gradients among Hispanics have been reported for obesity,16 smoking,17 body mass index (BMI),18 low birthweight,7,1922 blood pressure,23 and clusters of cardiovascular risk factors.24 Two recent studies offer somewhat broader assessments. Crimmins et al.25 noted the absence of education gradients in disease prevalence among Hispanics (and African Americans), although their analysis was restricted to elderly individuals. Winkleby and Cubbin8 demonstrated that education and income differentials for 9 health-related variables were weaker among Hispanic adults than among Whites or African Americans. Nevertheless, in general, these weaker Hispanic gradients have been mentioned only in passing (if at all) in the research on social inequalities in health conducted to date; moreover, the scope of the patterns observed among Hispanics has not been recognized, and little or no discussion has been offered regarding the underlying reasons for the small or nonexistent social gradients in this population. In this study, we used 3 different data sets to examine associations between educational level and numerous health behaviors and outcomes in a specific group of Hispanics: Mexican-origin adults, adolescents, and infants. Also, we formulated several hypotheses in an attempt to explain differences in such associations between the Mexican-origin population of the United States and non-Hispanic Whites.
Study Samples Our analyses were based on data derived from (1) the Los Angeles Family and Neighborhood Survey (LAFANS), conducted during 2000 and 2001 in Los Angeles County; (2) the first 2 waves of the Fragile Families and Child Wellbeing Study (FFCWS), conducted in 20 US cities during 1998 to 2002; and (3) the 1997 through 2001 versions of the National Health Interview Survey (NHIS). Because of variations in health and survival status among Hispanic groups, we restricted the Hispanic sample to individuals of Mexican origin, who represented the largest Hispanic group in all of the data sets. Sample sizes were insufficient to allow consideration of other national origin groups. The Mexican-origin sample of adults included in our analyses was made up of individuals born in Mexico ("Mexican immigrants") along with those born in the 50 states and the District of Columbia ("US-born Mexican Americans"). We present separate estimates for these 2 groups. The sample of Mexican-born adolescents (from LAFANS) was too small for analysis, and the infant sample (from the FFCWS) was restricted to those born in the United States. Ethnic classifications were based on respondents self-reports, and questions regarding whether respondents were born in the United States were used to obtain information on nativity status. LAFANS, which was based on a representative sample of households and neighborhoods in Los Angeles County, collected detailed information from randomly selected adults, children and their siblings, and primary caregivers. The sample used in the current analysis included 2454 adults (1894 years of age) and 814 adolescents (1217 years of age). The FFCWS followed a birth cohort of new, mostly unwed parents and their children in 20 cities throughout the United States. Baseline interviews were conducted with mothers in the hospital shortly after delivery (we did not include data on interviews with fathers). We used data from the sample of mothers who responded to the first reinterview (90.5% of mothers), which occurred between 12 and 18 months after the childs birth. The sample included 1772 mothers (1449 years of age) and the same number of infants (1218 months of age). The NHIS, a nationally representative cross-sectional survey of the civilian, noninstitutionalized population of the United States, has been conducted annually since 1957. To cover a time period similar to those covered by LAFANS and FFCWS, we used pooled data for the 5 annual waves of the NHIS conducted between 1997 and 2001. Although the questionnaire used varies from wave to wave, the items included in our analysis were generally the same within the period of the study with the exception of items focusing on depressive symptoms, which were included only in 1999. The sample used in this analysis was composed of 98777 adults (1864 years of age).
Outcome and Explanatory Variables
The smoking variable indicated whether the respondent currently smoked (among adults) or whether he or she had ever smoked (among adolescents). The drinking variable indicated whether the respondent was a binge or heavy drinker. Binge drinking was defined as consumption of at least 5 drinks on 1 or more occasions during the past 30 days (LAFANS); heavy drinking was defined as consumption of at least 5 drinks during a single given day at least once in the past year (NHIS). Among adolescents, we also examined whether or not they had ever consumed an alcoholic drink.
Participants BMIs were derived from self-reported height and weight information in the NHIS and LAFANS. Adults with BMIs of 25 kg/m2 or higher were classified as overweight or obese; for adolescents, the corresponding cut point was defined as a BMI at or above the age- and gender-specific 85th percentile.26 The work limitations variable reflected whether respondents reported having health problems that limited their ability to work (specific item wording varied across the surveys; see Table 2
Information for infants was based on mothers reports shortly after the birth (for birth-weight) or at the first reinterview. Low birth-weight was defined as 2500 g or less. We assessed whether infants had any physical disability at 12 to 18 months of age and whether they had asthma at 12 to 18 months of age. In the case of all 3 surveys, explanatory variables included age (in complete years), gender, self-reported ethnicity (and, among adults, nativity), and completed years of education (continuous variable).
Statistical Analysis Individuals missing information on any of the explanatory or outcome variables were excluded from the analysis. The number of missing observations varied across health outcomes but was typically small and unlikely to have biased the estimates. For example, the percentage of NHIS observations with missing information on either the explanatory variables or the outcome ranged from approximately 1% (for smoking and work limitations) to approximately 4% (for overweight or obese). For the NHIS and LAFANS, we used survey commands in Stata software that adjusted for clustering and stratification in estimations of standard errors.29
Tables 2
Sample sizes varied slightly across the different outcomes because of differences in amounts of missing data. The models for depressive symptoms were derived from samples much smaller than those for the other variables, because these data were collected in only 1 of the 5 NHIS years assessed and for only a subset of LAFANS respondents. The maximum sample sizes for each ethnic/nativity group are presented in Tables 2
Table 1
The coefficients shown in Table 2
Consistent with the literature, all of the coefficients for Whites shown in Table 2
Given the much larger sample sizes in the NHIS, these differences across surveys are not surprising. With the exception of work limitations, the coefficients for individuals of Mexican origin were very close to zero or even slightly positive, suggesting little or no differences according to education. For most of these health measures, the differences in education gradients between White and Mexican-origin adults were statistically significant (Table 2
The coefficients estimated from the NHIS for Mexican immigrants and US-born Mexican Americans (Table 2 These comparisons suggest that estimated education gradients were weaker (i.e., less negative) among Mexican immigrants than among US-born Mexican Americans for some of the health measures. Statistical tests (data not shown) indicated that, in the case of 2 of the NHIS outcomes (smoking and work limitations), gradients for Mexican immigrants were significantly different (P<.05) from those for US-born Mexican Americans. However, the corresponding tests for the FFCWS and LAFANS indicated that the difference between US-born Mexican Americans and Mexican immigrants was statistically significant (P<.05) only for work limitations (and only in LAFANS).
The estimated coefficients for Mexican-origin and White adolescents in LAFANS, shown in Table 3
The results for FFCWS infants, shown in Table 4
Our study identifies a striking phenomenon in the US Mexican-origin population that has received little attention in the public health and social science literatures: the absence of notable education differentials for numerous health-related variables among infants, adolescents, and adults versus the corresponding patterns for Whites. In the case of adults, these weak gradients appeared more frequently among Mexican immigrants than among US-born Mexican Americans, although numerous differences between these 2 Mexican-origin groups were not statistically significant.
Possible Explanations We speculate that the reason for these flat or reversed social gradients is that, in Mexico, those who are poor are unable to afford higher calorie foods, cigarettes, or alcohol and are more likely to engage in exercise (through manual labor) than individuals of higher SES. Because health-related habits are often formed by early adulthood, social differentials in health among recent Mexican immigrants are likely to be similar to those among people living in Mexico. Because parental health behaviors have a substantial influence on the behavior of children and adolescents,36 these patterns may also be reproduced, at least in part, in subsequent generations. A second possibility is related to the "healthy migrant" hypothesis; that is, healthy individuals in Mexico and other countries of origin are believed to be more likely than less healthy individuals to immigrate to the United States.4 We believe that this selective migration process is likely to be especially prevalent among the poor. Although such an explanation seems plausible given that wealthier potential immigrants have access to many more resources to facilitate their migration than do poor residents, there is, to our knowledge, virtually no supporting or refuting evidence. If either or both of these migration-related explanations are primarily responsible for the relatively weak education gradients found among individuals of Mexican origin, we would expect Mexican immigrants to have weaker gradients than US-born Mexican Americans. Our results revealed that whereas this was true for some health measures (particularly work limitations), the differences between Mexican immigrants and US-born Mexican Americans were quite modest for other outcomes (drinking and obesity), and many were not statistically significant. Moreover, the gradients for US-born Mexican Americans were sometimes weaker than those for non-Hispanic Whites, suggesting that there may be other explanations for these findings. A third set of hypotheses, which we refer to broadly as acculturation and assimilation, also may be important. These explanations are linked with a compositional effect that derives from differing distributions of nativity according to level of education: Hispanics at relatively high education levels are more apt to be second-generation (or higher) immigrants and to have resided longer in the United States than those at low education levels. The public health literature suggests that although immigrants from Latin America may arrive in the United States with relatively healthy values and behaviors, these values and behaviors gradually disappear during the process of assimilation.37,38 Moreover, the discrimination and lack of opportunity faced by members of some immigrant groups may result in their adopting detrimental behaviors and experiencing the negative health consequences associated with chronic stress.39,40 An alternative perspective, known as "segmented assimilation," suggests that immigrants from less favored ethnic groups have little alternative but to assimilate into disadvantaged segments of US society. As a result, they adopt the poor health behaviors of others around them and ultimately experience negative health outcomes.41,42 Taken together, these migration and acculturation hypotheses may account for the pattern observed here in which less educated Hispanics fared better than their White counterparts on numerous health variables and more educated Hispanics sometimes fared worse (data not shown).
Future Directions Although weak social gradients in health may appear to be desirable because they signal the absence of social inequalities, disparities in health within the Hispanic population and between Hispanics and other groups are large.43,44 The Hispanic mortality paradox suggests that the health status of Hispanics is superior to that of Whites, but deeper investigation reveals that this advantage is largely restricted to immigrants.4 Although overall Hispanics have better mortality profiles than Whites, they are more likely than Whites to die from some leading causes (e.g., HIV/AIDS and diabetes45) and to suffer from certain chronic conditions (e.g., obesity46). These disparities, combined with low rates of health insurance coverage and use of health care47 and health-related behaviors that may worsen with length of residence in the United States,48 are likely to foreshadow future health problems for the US Hispanic population. The patterns of social disparities in health in Mexico and other immigrant countries of origin are likely to change over the coming decades. Indeed, there is already evidence that some of the reverse social gradients in Latin American countries are changing direction as living standards rise, with those living in poverty becoming more disadvantaged relative to their more educated and wealthier counterparts across a broader spectrum of health measures.49,50 Given the likelihood that high rates of immigration from Latin America will continue and that one quarter of the US population will be Hispanic by 2050, increased attention to these enigmatic patterns is essential.51
This research was supported in part by the National Institute on Aging through the Center for Demography of Aging, Princeton University, the National Institute of Child Health and Development (grant R24 HD043588), and the Robert Wood Johnson Health and Society Scholars program. The Fragile Families and Child Wellbeing Study was funded by the National Institute of Child Health and Human Development (grant 5R01 HD36916 05) and a consortium of private foundations. The Los Angeles Family and Neighborhood Survey was funded by the National Institute of Child Health and Human Development (grant R01 HD35944); the Office of Behavioral and Social Sciences Research, National Institutes of Health; the Office of the Assistant Secretary for Planning and Evaluation, US Department of Health and Human Services; and the Los Angeles County Urban Research Group. We thank Diana Sacke for assistance with the preparation of the manuscript and Germán Rodríguez for helpful comments and advice.
Human Participant Protection
Peer Reviewed
Contributors Accepted for publication December 7, 2005.
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