Migration Selection, Protection, and Acculturation in Health: A Binational Perspective on Older Adults

In this article, we test for four potential explanations of the Hispanic Health Paradox (HHP): the “salmon bias,” emigration selection, and sociocultural protection originating in either destination or sending country. To reduce biases related to attrition by return migration typical of most U.S.-based surveys, we combine data from the Mexican Health and Aging Study in Mexico and the U.S. National Health Interview Survey to compare self-reported diabetes, hypertension, current smoking, obesity, and self-rated health among Mexican-born men ages 50 and older according to their previous U.S. migration experience, and U.S.-born Mexican Americans and non-Hispanic whites. We also use height, a measure of health during childhood, to bolster some of our tests. We find an immigrant advantage relative to non-Hispanic whites in hypertension and, to a lesser extent, obesity. We find evidence consistent with emigration selection and the salmon bias in height, hypertension, and self-rated health among immigrants with less than 15 years of experience in the United States; we do not find conclusive evidence consistent with sociocultural protection mechanisms. Finally, we illustrate that although ignoring return migrants when testing for the HHP and its mechanisms, as well as for the association between U.S. experience and health, exaggerates these associations, they are not fully driven by return migration-related attrition.     

我国人口流动中的健康选择机制研究

利用2008年中国流动与健康调查数据,对农村留守人口、农村外出返乡人口、乡城流动人口以及城镇居民等不同流动特征群体之间的健康差异进行比较,并系统检验了我国人口流动过程中的两种健康选择机制——"健康移民"(healthy migrant)效应和"三文鱼偏误"(salmon bias)效应。模型分析结果表明,我国人口流动存在着较为明显的"健康移民"和"三文鱼偏误"选择效应。在控制被访者的年龄、性别、主要社会经济特征以及相关健康行为后,流动人口自评一般健康、慢性病状况、经常性身体不适和肺活量等健康指标显著优于农村留守人口,乡城流动人口患有慢性病和出现经常性身体不适的可能性也显著低于农村返乡人口。在控制相关变量后,乡城流动人口与城镇居民的健康状况(除慢性病和心率过高症状外)不存在显著差别。     

Networks Matter: Male Mexican Migrants’ Use of Hospitals

Using the behavioral model for health care use and unique data from the Mexican migration project, we explore the factors associated with hospital use among Mexican male migrants to the US. Twenty-eight percent of the respondents reported receiving healthcare from a hospital. In addition to established enabling factors of time in the US and English language ability, this research points to the importance of family social networks as enabling hospital health care use among migrants. Migrants with more ties to family members with migration experience have an increased likelihood of using emergency room healthcare. The research adds to the body of literature by providing evidence that ties to individuals with US migration experience increases migrants’ probability of accessing healthcare at hospitals.     

Investigating Health Selection Within Mexico and Across the US Border

Despite acquiring lower levels of attainment and earnings, Mexican immigrants exhibit favorable health outcomes relative to their native-born counterparts. And while scholars attempt to reconcile this so-called paradoxical relationship with a variety of theoretical and empirical approaches, patterns of selective migration continue to receive considerable attention. The present study contributes to the literature on health selection by extending the healthy migrant hypothesis in a number of ways. First, we rely on a unique combination of datasets to assess whether the healthy are disproportionately more likely to migrate. We use the latest wave of the Mexican Family Life Survey and the 2013 Migrante Study, a survey that is representative of Mexican-born persons who are actively migrating through Tijuana. Pooling these data also allow us to differentiate between internal and US-bound migrants to shed light on their respective health profiles. Results provide modest support for the healthy migrant hypothesis. Although those who report better overall health are more likely to migrate, we find that the presence of certain chronic conditions increases migration risk. Our findings also suggest that internal migrants are healthier than those traveling to the US, though this is largely because those moving within Mexico reflect a younger and more educated population. This study takes an important step in uncovering variation across migrant flows and highlights the importance of the timing at which health is measured in the migration process.     

The Impact of Salmon Bias on the Hispanic Mortality Advantage: New Evidence from Social Security Data

A great deal of research has focused on factors that may contribute to the Hispanic mortality paradox in the United States. In this paper, we examine the role of the salmon bias hypothesis—the selective return of less-healthy Hispanics to their country of birth—on mortality at ages 65 and above. These analyses are based on data drawn from the Master Beneficiary Record and NUMIDENT data files of the Social Security Administration. These data provide the first direct evidence regarding the effect of salmon bias on the Hispanic mortality advantage. Although we confirm the existence of salmon bias, it is of too small a magnitude to be a primary explanation for the lower mortality of Hispanic than non-hispanic (NH)-White primary social security beneficiaries. Longitudinal surveys that follow individuals in and out of the United States are needed to further explore the role of migration in the health and mortality of foreign-born US residents and factors that contribute to the Hispanic mortality paradox.     

Selection,selection, selection: the impact of return migration

The evidence on the impact of return migration on the sending country is rather sparse, though growing. The contribution of this paper is in addressing various selectivity problems while quantifying the impact of return migration on wages of returnees using non-experimental data. Using Egyptian household-level survey data, I estimate the wages of return migrants controlling for several selectivity biases arising from emigration choice, return migration choice, labor force participation choice, and occupational choice following return. The findings provide strong evidence that overseas temporary migration results in a wage premium upon return, even after controlling for the various potential selection biases. However, the estimates underscore the significance of controlling for both emigration and return migration selections. Ignoring the double selectivity in migration would overestimate the impact of return migration on the wage premium of returnees, as migrants are positively selected relative to non-migrants, but returnees are negatively selected among migrants.     

The Consequences of Migration to the United States for Short-Term Changes in the Health of Mexican Immigrants

Although many studies have attempted to examine the consequences of Mexico-U.S. migration for Mexican immigrants’ health, few have had adequate data to generate the appropriate comparisons. In this article, we use data from two waves of the Mexican Family Life Survey (MxFLS) to compare the health of current migrants from Mexico with those of earlier migrants and nonmigrants. Because the longitudinal data permit us to examine short-term changes in health status subsequent to the baseline survey for current migrants and for Mexican residents, as well as to control for the potential health selectivity of migrants, the results provide a clearer picture of the consequences of immigration for Mexican migrant health than have previous studies. Our findings demonstrate that current migrants are more likely to experience recent changes in health status—both improvements and declines—than either earlier migrants or nonmigrants. The net effect, however, is a decline in health for current migrants: compared with never migrants, the health of current migrants is much more likely to have declined in the year or two since migration and not significantly more likely to have improved. Thus, it appears that the migration process itself and/or the experiences of the immediate post-migration period detrimentally affect Mexican immigrants’ health.     

International Migration and Educational Assortative Mating in Mexico and the United States

This paper examines the relationship between migration and marriage by describing how the distributions of marital statuses and assortative mating patterns vary by individual and community experiences of migration. In Mexico, migrants and those living in areas with high levels of out-migration are more likely to be in heterogamous unions. This is because migration increases the relative attractiveness of single return migrants while disproportionately reducing the number of marriageable men in local marriage markets. In the United States, the odds of homogamy are lower for migrants compared with nonmigrants; however, they do not vary depending on the volume of migration in communities. Migrants are more likely than nonmigrants to “marry up” educationally because the relatively small size of this group compels them to expand their pool of potential spouses to include nonmigrants, who tend to be better educated than they are. Among migrants, the odds of marrying outside of one’s education group increase the most among the least educated. In Mexican communities with high rates of out-migration, the odds of marrying outside of one’s education group are highest among those with the highest level of education. These findings suggest that migration disrupts preferences and opportunities for homogamy by changing social arrangements and normative climates.     

How Do Tougher Immigration Measures Affect Unauthorized Immigrants?

The recent impetus of tougher immigration-related measures passed at the state level raises concerns about the impact of such measures on the migration experience, trajectory, and future plans of unauthorized immigrants. In a recent and unique survey of Mexican unauthorized immigrants interviewed upon their voluntary return or deportation to Mexico, almost a third reported experiencing difficulties in obtaining social or government services, finding legal assistance, or obtaining health care services. Additionally, half of these unauthorized immigrants reported fearing deportation. When we assess how the enactment of punitive measures against unauthorized immigrants, such as E-Verify mandates, has affected their migration experience, we find no evidence of a statistically significant association between these measures and the difficulties reported by unauthorized immigrants in accessing a variety of services. However, the enactment of these mandates infuses deportation fear, reduces interstate mobility among voluntary returnees during their last migration spell, and helps curb deportees’ intent to return to the United States in the near future.     

Declining Return Migration From the United States to Mexico in the Late-2000s Recession: A Research Note

Researchers in the United States and Mexico have variously asserted that return migration from the United States to Mexico increased substantially, remained unchanged, or declined slightly in response to the 2008–2009 U.S. recession and fall 2008 global financial crisis. The present study addresses this debate using microdata from 2005 through 2009 from a large-scale, quarterly Mexican household survey, the National Survey of Occupation and Employment (ENOE), after first validating the ENOE against return-migration estimates from a specialist demographic survey, the National Survey of Demographic Dynamics (ENADID). Declines in annual return-migration flows of up to a third between 2007 and 2009 were seen among the predominantly labor-migrant groups of male migrants and all 18- to 40-year-old migrants with less than a college education; and a decline in total return migration was seen in the fourth quarter of 2008 (immediately after the triggering of the global financial crisis) compared with the fourth quarter of 2007.     

Economic opportunity in mexico and return migration from the United States

I analyze the influence of the economic characteristics of origin area on trip duration for Mexican migrants in the United States. I argue that migrants from economically dynamic areas in Mexico with favorable opportunities for employment and small capital investment have a larger incentive to stay in the United States longer and to withstand the psychic costs of separation from family and friends than do migrants from economically stagnant areas in Mexico, where the productive uses of savings are severely limited. In line with this argument we should expect investment opportunities in migrants’ origin areas to be associated positively with migrants’ trip duration in the United States. To test this hypothesis I use individual- and household-level data on U.S migration experience collected in 13 Mexican communities. Evidence from parametric hazards models supports the idea that economic characteristics of origin areas influence the motivations and strategies of Mexican migrants in the United States.     

Two Decades of Negative Educational Selectivity of Mexican Migrants to the United States

Immigration is commonly considered to be selective of more educated individuals. Previous US studies comparing the educational attainment of Mexican immigrants in the United States to that of the Mexican resident population support this characterization. Upward educational‐attainment biases in both coverage and measurement, however, may be substantial in US data sources. Moreover, differences in educational attainment by place size are very large within Mexico, and US data sources provide no information on immigrants' places of origin within Mexico. To address these problems, we use multiple sources of nationally representative Mexican survey data to re‐evaluate the educational selectivity of working‐age Mexican migrants to the United States over the 1990s and 2000s. We document disproportionately rural and small‐urban‐area origins of Mexican migrants and a steep positive gradient of educational attainment by place size. We show that together these conditions induced strongly negative educational selection of Mexican migrants throughout the 1990s and 2000s. We interpret this finding as consistent with low returns to education among unauthorized migrants and few opportunities for authorized migration.     

Paradox lost: Explaining the hispanic adult mortality advantage

We tested three competing hypotheses regarding the adult "Hispanic mortality paradox": data artifact, migration, and cultural or social buffering effects. On the basis of a series of parametric hazard models estimated on nine years of mortality follow-up data, our results suggest that the "Hispanic" mortality advantage is a feature found only among foreign-born Mexicans and foreign-born Hispanics other than Cubans or Puerto Ricans. Our analysis suggests that the foreign-born Mexican advantage can be attributed to return migration, or the "salmon-bias" effect. However, we were unable to account for the mortality advantage observed among other foreign-born Hispanics.     

Social networks and their impact on the earnings of Mexican Migrants

We examine the impact of different types of social networks on the wages earned by unauthorized and legal Mexican migrants during their last U.S. trip. Familial ties raise unauthorized and legal migrants' hourly wages by an average of 2.6% and 8%, respectively, and friendship ties increase their wages by 5.4% and 3.6%, correspondingly. Furthermore, family ties seem to comparatively favor legal migrants in terms of earnings, raising their wages by approximately 0.9% more than for similar unauthorized migrants. These results underscore the potentially important role of social networks in raising Mexican migrants'earnings, particularly among unauthorized migrants. By increasing the returns to migration, social networks may provide a stimulus to continued emigration.     

Mexican Migration to the United States Pacific Northwest

The migration of Mexicans to the Pacific Northwest region(PNW) of the United States has received little attention in scholarly literature. This is unfortunate, as Mexican migration has significantly affected this region, both economically and culturally. Using data supplied by the Mexican Migration Project, we compare the characteristics of Mexican migrantsto the Pacific Northwest with characteristics of Mexicans who migrate to other parts of the U.S. The data reveal significant differences between the two groups: Mexican migrants to the PNW earn lower U.S. wages, are less likely to migrate illegally, and more commonly work in agriculture. They also are more transitory in nature, making more frequent, shorter trips to the U.S. Most interesting is that PNW migrants send significantly more money back home compared to Mexican migrants in other parts of the U.S., even after controlling for the aforementioned differences in individual characteristics.     

Migration and Health Selectivity in the Context of Internal Migration in China, 1997–2009

Using data from the 1997?C2009 waves of the China Health and Nutrition Survey, we examine the ??healthy migrant hypothesis?? in a setting where internal migrants face significant barriers to movement. Going beyond much of the existing literature in the Chinese context, we use an appropriate comparison between migrants and non-migrants at origin, using detailed health measures, and data spanning a wider geographic and temporal extent than had been previously considered. Consistent with research from both international migration contexts and other internal migration settings, we find that migrants are positively selected on the basis of health, although the relationship between health and migration diminishes across time. The strongest evidence for health selection comes from a subjective self-reported health measure, although we also find evidence for selection against those experiencing acute health conditions. We speculate that the across-time differentiation may be caused by the rapid social, economic and policy changes in China??s economic reform era. Thus, we suggest that migration scholars should consider the changing macro context when theorizing about selection factors.     

Fertility adaptation by rural-urban migrants in developing countries: The case of Korea

Summary The purpose of this study is to develop and test a model to assess the influence of rural-urban migration on fertility in less developed countries. Two major reasons may account for lower fertility levels observed among such migrants than among women who remained in rural areas: a selection effect, and adaptation to constraints in the area of destination. Results of previous studies have only rarely suggested that the effect of adaptation was significant. We use the detailed personal migration and pregnancy histories recorded in the Korean World Fertility Survey of 1974 and an autoregressive model to control for unobservable variations in personal preferences for different family sizes between migrants and non-migrants. Our study provides evidence that adaptation following rural-urban migration is a significant factor which explains the lower fertility of rural-urban migrants compared with that of rural stayers.     

Health Selection,Migration, and HIV Infection in Malawi

Despite its importance in studies of migrant health, selectivity of migrants—also known as migration health selection—has seldom been examined in sub-Saharan Africa (SSA). This neglect is problematic because several features of the context in which migration occurs in SSA—very high levels of HIV, in particular—differ from contextual features in regions that have been studied more thoroughly. To address this important gap, we use longitudinal panel data from Malawi to examine whether migrants differ from nonmigrants in pre-migration health, assessed via SF-12 measures of mental and physical health. In addition to overall health selection, we focus on three more-specific factors that may affect the relationship between migration and health: (1) whether migration health selection differs by destination (rural-rural, rural-town, and rural-urban), (2) whether HIV infection moderates the relationship between migration and health, and (3) whether circular migrants differ in pre-migration health status. We find evidence of the healthy migrant phenomenon in Malawi, where physically healthier individuals are more likely to move. This relationship varies by migration destination, with healthier rural migrants moving to urban and other rural areas. We also find interactions between HIV-infected status and health: HIV-infected women moving to cities are physically healthier than their nonmigrant counterparts.