Housing Tenure and Mental Health Across Adulthood: Evidence from the 1970 British Birth Cohort

Technical Summary: Housing Tenure and Mental Health Across Adulthood

Problem Statement
Housing tenure is a fundamental social determinant of health, yet the relationship between housing status (owning vs. renting) and mental health remains complex and often contradictory in existing literature. While cross-sectional studies frequently associate home ownership with better mental health, these designs cannot clarify causality or account for the dynamic nature of housing trajectories over a lifetime. Furthermore, existing longitudinal studies have yielded mixed results, with some suggesting that the mental health benefits of ownership are merely reflections of pre-existing socioeconomic advantages, while others indicate a protective effect.

There is a specific gap in understanding how trajectories of housing tenure across adulthood—rather than a single point-in-time status—affect midlife mental health. This is particularly relevant in the UK context, where declining affordability and delayed entry into the housing market have reshaped ownership patterns for recent generations. This study addresses the need to examine how sustained exposure to home ownership, and the timing of entry into ownership, influences psychological distress and positive mental wellbeing in midlife, while rigorously controlling for time-varying confounding.

Methodology
The study utilizes data from the 1970 British Birth Cohort (BCS70), a longitudinal study following individuals born in 1970 across England, Scotland, and Wales. The analytic sample consisted of 8,016 participants who provided housing tenure and mental health data at age 51.

• Exposure Definition: Housing tenure was measured repeatedly at ages 26, 30, 34, 42, and 46. Tenure was dichotomized into "owner" (outright or with mortgage) and "non-owner" (renting or other arrangements). The study defined four prespecified ownership-history regimes to capture longitudinal patterns:
  1. Always owning: Ownership at all observed adult sweeps.
  2. Early ownership: First ownership at age 30 or 34, remaining an owner thereafter.
  3. Late ownership: First ownership at age 42 or 46, remaining an owner thereafter.
  4. Never owning: No ownership at any observed sweep.
• Outcomes: Mental health at age 51 was assessed via two metrics:
  1. Psychological distress: Measured using the Malaise Inventory (score 0–9).
  2. Positive mental wellbeing: Measured using the Short Warwick–Edinburgh Mental Well-Being Scale (SWEMWBS), standardized to standard deviation (SD) units.
• Causal Inference Framework: To address time-varying confounding (where factors like income or health influence both future housing and future mental health), the authors employed G-estimation of a Structural Nested Mean Model (SNMM). This approach allows for the estimation of causal contrasts between different exposure histories while adjusting for confounders that are themselves affected by prior exposure.
• Covariates: The models adjusted for a comprehensive set of time-invariant early-life factors (parental social class, parental tenure, cognitive ability, internalizing symptoms) and time-varying adult factors (occupational social class, income, self-rated health, and prior mental health).
• Statistical Analysis: Models were estimated using the lavaan package in R with robust maximum likelihood (MLR). Non-response weights and full information maximum likelihood were used to address selective attrition and missing data. Confidence intervals were derived via nonparametric percentile bootstrapping.

Key Results

• Sustained Ownership vs. Never Owning: After adjusting for time-varying socio-economic and health-related confounding, sustained home ownership across adulthood (ages 26–46) was significantly associated with better mental health outcomes at age 51 compared to never owning.
  • Psychological Distress: Associated with a reduction of 0.21 points on the Malaise Inventory (ATE −0.21, 95% CI −0.47 to −0.03).
  • Positive Wellbeing: Associated with an increase of 0.56 standard deviations (ATE 0.56, 95% CI 0.38 to 0.67).
• Timing and Persistence (Regime Contrasts):
  • Late Ownership: Entering ownership in one's 40s was associated with lower psychological distress (ATE −0.15) and higher wellbeing (ATE 0.17 SD) compared to never owning.
  • Early Ownership: Entering ownership in one's 30s showed a similar direction of effect for distress (ATE −0.12) but with a confidence interval crossing zero. For wellbeing, early ownership was strongly associated with higher scores (ATE 0.40 SD).
  • Gradient: A graded pattern emerged for wellbeing, where "always owners" had the highest scores, followed by "early owners," then "late owners," with "never owners" having the lowest. For psychological distress, the distinction between early and late ownership was less clear, though "always owners" showed slightly lower distress than "early owners."

Key Contributions

1. Longitudinal Causal Estimation: The study moves beyond cross-sectional associations by using G-estimation to estimate the causal effect of housing trajectories rather than static tenure status, explicitly accounting for time-varying confounders affected by prior exposure.
2. Differentiation of Outcomes: By analyzing both psychological distress and positive mental wellbeing, the study reveals that the timing and persistence of ownership may be more critical for positive wellbeing than for the reduction of distress.
3. Life-Course Perspective: The findings highlight that the mental health implications of housing are cumulative. Sustained exposure to ownership yields more favorable outcomes than transient or late-entry ownership, suggesting housing tenure acts as a cumulative life-course exposure.

Significance and Claims
The authors claim that their findings support conceptualizing housing tenure as more than a mere marker of socioeconomic position; it likely captures material assets, housing security, stability, and control. The study suggests that the timing and persistence of home ownership are distinct factors relevant to midlife mental health, particularly for positive wellbeing.

The paper posits that these findings are relevant to the concept of Generational Health Drift, where later-born cohorts may experience poorer mental health due to delayed entry into ownership and more fragmented housing trajectories. However, the authors remain modest, noting that the specific mechanisms (e.g., wealth accumulation vs. residential control) were not directly tested and remain hypotheses. They explicitly state that their results should not be interpreted as evidence that promoting home ownership alone will improve mental health, but rather that improving access to stable, secure, and affordable housing across all tenures is a critical component of the public mental health agenda. The study concludes that housing tenure is a significant life-course exposure that warrants further investigation into how changing housing trajectories contribute to intergenerational mental health inequalities.