Poor mental health earlier in life leads to poor physical health in later life, according to a new study.
A collaboration between the University of Auckland, the University of Michigan and Duke University in the US, the study
investigated 50 years of births in New Zealand and followed them for 30 years.
It found that people admitted to hospital for a mental health issue had increased risk of mortality within the 30-year
period, regardless of whether they had also been in hospital for their physical health. The results were the same for
men and women across the age range.
Further, a mental health hospitalisation increased the risk of a later admission for physical health, independent of
previous hospital visits for physical health.
Results were again the same for men and women across the age range, associations were similar for all mental disorder
types and risks were increased for all chronic physical health conditions.
One of the study’s authors, Associate Professor Barry Milne from University of Auckland social research centre COMPASS,
says results suggest that dealing with mental health disorders early may help prevent later disease.
“Even if the association is not causal, mental disorders are salient early warning signs for later physical health
problems and early death,” he says.
“This suggests the importance of joined-up healthcare services, for example, embedding physical health screening and
prevention into mental health treatment.”
Led by Assistant Professor Leah Richmond-Rakerd from the University of Michigan, the study assessed hospitalisations for
mental health conditions, chronic physical health conditions and mortality over a 30-year period from 1988 to 2018.
Mental health conditions diagnosed in inpatient hospitals affected four percent of the population, and included
substance use disorder, psychotic disorder, mood disorder, neurotic disorder, self-harm and other disorders.
Chronic physical conditions diagnosed in inpatient hospitals, which affected 20 percent of the population, included
gout, diabetes, chronic obstructive pulmonary disease (COPD), traumatic brain injury, stroke, myocardial infarction,
coronary heart disease and cancer.
The cohort was 2,349,897 people born in New Zealand between 1928 and 1978 and aged from 10 to 60 at the start of the
period.
Published today in JAMA Network Open, the study is distinguished by its long-term follow-up, the use of hospital records rather than a retrospective report,
and the ability to establish a chronological sequence.
A further study will investigate the role of mental health in later dementia.
Funding for the research was through grants AG032282 and AG049789 from the National Institute on Aging (NIA) and grant
MR/P005918 from the U.K. Medical Research Council.
Additional support was provided by NIA grant P30 AG034424 through the Duke Population Research Institute, National
Institute of Child Health and Development grant P2C HD065563 through the Duke Population Research Center, NIA grant P30
AG028716, and the Jacobs Foundation.