Housing Types Impact Cardiovascular Death Risk in Japan

On October 10, 2025, researchers from the Institute of Science Tokyo published a significant study in the journal BMJ Public Health, highlighting a critical connection between housing types and cardiovascular death risks among older adults in Japan. This cohort study involved nearly 39,000 participants with an average age of 73.6 years, showcasing that those residing in rental flats and owner-occupied detached houses experience higher mortality rates from cardiovascular diseases (CVD) compared to individuals living in owner-occupied flats.

Background of the Study

The research sheds light on the ways housing conditions can directly impact health outcomes. The World Health Organization (WHO) recognized the significance of housing quality in its Housing and Health Guidelines published in 2018. This report outlined that substandard housing can lead to serious health issues, including an increased prevalence of CVD, due to factors such as cold indoor environments that contribute to elevated blood pressure.

With the acknowledgment from Japan's Cardiovascular Disease Clinical Practice Guidelines in 2024 about the influence of social environmental factors such as housing on cardiovascular health, this study by Wataru Umishio and his team aimed to provide empirical evidence to support these claims.

Key Findings

The findings revealed that older adults living in rental accommodations or detached houses are at a greater risk of cardiovascular mortality, which can be attributed to several factors:

• Indoor Temperature Variability: Detached houses are more susceptible to temperature fluctuations due to exposure on all sides, leading to colder indoor conditions.
• Insulation Quality: Many rental flats lack proper insulation, with statistics indicating that only 15% of rental homes feature double-glazed windows, compared to 38% of owner-occupied homes.
• Gender Differences: The study observed that men were particularly at risk, as they tend to have higher blood pressure levels than women, especially in older age groups.

Table of Cardiovascular Death Risks by Housing Type

Implications of the Study

These findings underscore the necessity for improved housing conditions that foster a healthier living environment, particularly for the aging population. The study's authors suggest that:

• Enhancing Insulation: Appropriate insulation in homes can stabilize indoor temperatures, potentially reducing cardiovascular-related health issues.
• Maintaining Indoor Temperatures: Keeping indoor temperatures above the WHO's recommended 18 °C is vital for promoting better health outcomes.

"Initiatives aimed at enhancing housing quality could vastly improve cardiovascular health and contribute to broader environmental benefits by reducing energy consumption," – Wataru Umishio, Assistant Professor, Department of Architecture, Science Tokyo.

Conclusion

The association between housing type and cardiovascular mortality in older adults emphasizes an often-overlooked dimension of public health. As urbanization increases and housing quality continues to vary, it is imperative to address these discrepancies to safeguard the health and well-being of vulnerable populations.

For more details on this study and its implications, you can access the full research paper: Housing type linked to cardiovascular death risk in older adults.

References

Umishio, W., et al. (2025). Combination of housing type (detached houses vs flats) and tenure (owned vs rented) in relation to cardiovascular mortality: findings from a 6-year cohort study in Japan, BMJ Public Health.

World Health Organization. (2018). Housing and Health Guidelines.

Japanese Society of Hypertension. (2024). Cardiovascular Disease Clinical Practice Guidelines.