The burden of disease due to chronic illnesses, especially mental health illnesses is rising in the UK

Earth and stethoscope

The NHS is thought of as a model health care system. It has experienced several reforms over the last 20 years, including greatly increased amounts of spending. So how have these changes affected the burden of disease due to mental health problems over this period, and how does the UK’s record in this area stack up against comparable countries?

A paper recently published in The Lancet used the Global Burden of Disease Study from 1990 and 2010, (discussed on the Lifestyle Elf ) to investigate changes in the burden of health in the UK over this period, and also to compare it to the other 18 countries assessed. It measured all forms of health, but we will highlight mental health outcomes here.

Methods

The Global Burden of Disease Study looked at major causes of disease burden and how these have changed over time. By using consistent definitions of illness across time and across countries it allows comparison of the UK and its progress to similarly wealthy and developed nations.

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The Global Burden of Disease Study compared changes in the burden of health in the UK to 18 other countries

Of particular interest, the study looked at disability and not just mortality – which can be a somewhat crude measure of the impact of disease, especially with chronic illnesses becoming increasingly important in the burden of disease.

The GBD uses several metrics to determine health loss:

  • Years of Life Lost due to premature mortality (YLLs),
  • Years Lived with Disability (YLDs), and
  • Disability-Adjusted Life-Years (DALYs).

Years of life lost (YLL) are calculated by multiplying the number of deaths in each age group by a reference life expectancy at that age – so a disease that kills many young people will generate a greater YLL than a disease that kills older people.

Years lived with disability (YLD) are calculated by multiplying the prevalence of a consequence of an illness by its disability weight. Disability weights are based largely on surveys of the general population – to determine how much disability is accounted for by blindness, for example, compared with being unable to walk.

Disability adjusted life years (DALY) are the sum of the above two numbers – representing the entire amount of healthy life years lost due to premature death and impaired function caused by an illness.

Results for mental illnesses

Years of Life Lost (YLL)

Self-harm, overwhelmingly related to mental health issues, has remained the number 8 cause of years of life lost in the UK from 1990 to 2010 in all age groups, and the number 2 cause in the 20-54 year old group.

The years of life lost due to drug use disorders have increased by 577% for all age groups, and 812% for those 20-54, who have also experienced a 230% increase in alcohol use disorders.

Years lived with disability (YLD)

Mental illnesses were the second greatest contributor to years lived with disability in 2010, with six out of the top twenty causes of years lived with disability being mental health disorders – major depression (third largest cause overall), anxiety, drug use, alcohol use, schizophrenia and bipolar disorder.

Disability adjusted life years (DALYs)

There are few good news stories in the mental health section - almost every mental health disorder increased its burden of disease

The report showed that almost every mental health disorder increased its burden of disease

Mental and behavioural disorders accounted for 1.65 million disability adjusted life years in 1990, increasing to 1.94 million in 2010 (an increase of 17%). As a point of comparison the number one cause of DALYs is cardiovascular disease which in the same period decreased by 39%.

There are few good news stories in the mental health section – almost every mental health disorder increased its burden of disease:

  • Alcohol use disorders increased the number of disability adjusted life years by 56.1%,
  • Unipolar depression increased by 9%,
  • Eating disorders increased by 53.9 %,
  • Opioid drug use increased by 56.3% and
  • Schizophrenia increased by 14%

Conclusions

For all age groups, the contribution of drug use disorders to premature mortality rose from 1990 to 2010 by 577%.

Because years lived with disability per person has not changed substantially from 1990 to 2010 but age-specific mortality has been falling, the importance of chronic disability is rising. The  second major causes of  years lived with disability in 2010 were mental and behavioural disorders (accounting for 21·5% of total years lived with disability).

Discussion

Mental health has fallen behind compared to physical health. Is the race for funding a fair contest?

In terms of global burden, mental health has fallen behind compared to physical health. Is the race for funding a fair contest?

Although the Global Burden of Disease Study 2010 had mixed changes for physical health (generally improved in absolute terms), overwhelmingly the message about mental disorders is negative, with increases on every metric used.

The authors note that, in contrast to improvement in several other areas of health, causes of chronic disability, including mental disorders and substance abuse do not get as much health policy attention. They advise that given the change in the pattern of health loss over the last 20 years that these conditions should be:

On the agenda for all UK public health agencies.

They argue that these issues, including mental disorders and the increasing effect of alcohol and drugs, will require:

Strong national and local leadership to ensure an effective multi-sectoral integrated response is achieved and sustained.

In plainer language: it’s time to apply the thought and investment that proved effective in dealing with acute bodily conditions to diseases that affect the mind. This must happen soon if the NHS is to continue to address the pressing health needs of UK citizens.

Link

Prof Christopher JL Murray MD et al. UK health performance: findings of the Global Burden of Disease Study 2010. The Lancet – 23 March 2013 Vol. 381, Issue 9871, Pages 997-1020 DOI: 10.1016/S0140-6736(13)60355-4 [Abstract]

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Mark Horowitz

Mark Horowitz

Mark is a training psychiatrist from Australia who is completing a PhD, at King’s College London, regarding the link between stress and depression. He would like to understand the biological mechanisms underlying this connection and this currently involves torturing human neural stem cells in a dish with stress hormones and inflammatory molecules, and investigating the extent to which antidepressants and fish oils can reverse these effects. He hopes to contribute to reducing the burden of depression through clinical practice, research and public engagement. He recently won the national competition ‘I’m a neuroscientist get me out here’ which impressed his mum.

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