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Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
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Is Health Contagious?-Based on Empirical Evidence From China Family Panel Studies' Data.

Feng Hu1, Xiaojiao Shi1, Haiyan Wang2

  • 1Global Value Chain Research Center, Zhejiang Gongshang University, Hangzhou, China.

Frontiers in Public Health
|July 19, 2021
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Summary

Health is contagious, as demonstrated by community health levels significantly impacting individual self-rated health. This effect varies across demographics and regions, particularly in areas with lower medical care access.

Keywords:
contagioncontagion mechanismendogeneity controlhealthhealth in Chinaself-rated health

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Area of Science:

  • Public Health
  • Sociology
  • Health Economics

Background:

  • Individual health is influenced by social factors.
  • Understanding health contagion is crucial for public health interventions.
  • Previous research has explored social determinants of health, but empirical analysis of health contagion in China is limited.

Purpose of the Study:

  • To empirically analyze the contagion of health within communities in China.
  • To identify factors influencing the heterogeneity of health contagion.
  • To examine the mechanisms driving health contagion.

Main Methods:

  • Utilized data from the China Family Panel Studies (CFPS).
  • Employed multiple regression analyses, controlling for individual, household, group, and regional characteristics.
  • Applied two-stage least squares (2SLS) to address endogeneity concerns.

Main Results:

  • The average health level of others in a community significantly and positively affects individual self-rated health.
  • Health contagion effects are more pronounced in elderly populations and rural areas, especially in central China with lower medical care levels.
  • The contagion effect did not significantly differ between genders.

Conclusions:

  • Health is demonstrably contagious, influenced by social and environmental factors.
  • Targeted public health strategies may be more effective when considering regional disparities and demographic vulnerabilities.
  • Social interaction and learning/imitation are key mechanisms underlying health contagion.