Explaining immigrant-native differences in health at birth: The role of immigrant selectivity in Spain

Area of Science:

• Public Health
• Sociology
• Demography

Background:

• The 'immigrant health paradox' suggests immigrants and their children exhibit better health than native-born populations.
• The 'selectivity hypothesis' posits this advantage stems from health-based or socioeconomic status (SES) selection prior to migration.

Purpose of the Study:

• To investigate immigrant-native birth health disparities in Spain.
• To determine if immigrants' educational selectivity explains these health gaps.
• To assess the universality of the selectivity hypothesis across different groups and outcomes.

Main Methods:

• Analysis of Spanish birth registry data from 2007-2019.
• Comparison of birth outcomes (low birthweight, macrosomia, gestational age) between immigrant and native-born populations.
• Statistical examination of the association between parental educational selectivity and birth health outcomes, controlling for SES.

Main Results:

• Babies born to immigrants showed a lower incidence of low birthweight (LBW) but higher rates of macrosomia and lower gestational age.
• Educational selectivity was linked to reduced LBW, particularly for immigrants from Northern Africa and Latin America, even after adjusting for SES.
• Selectivity did not significantly impact other measured birth outcomes.

Conclusions:

• The study partially confirms the selectivity hypothesis as an explanation for the immigrant health paradox in birth outcomes.
• The findings highlight that the influence of selectivity is not uniform, varying by immigrant origin and specific health indicators.
• The universality of the selectivity hypothesis across diverse immigrant populations and health outcomes requires further investigation.