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Why Women Need This Minimum Household Income Before Giving Birth

09/12/2013 05:11 EDT | Updated 11/12/2013 05:12 EST

As health equity researchers, it's part of our job to measure the relationship between social conditions and health outcomes. Often, we try and link one social condition, like income, to one health outcome, like diabetes, low birth weight or mental illness -- the list goes on. Using this approach, we are able to demonstrate when low income is associated with a higher risk of having a specific problem. What we don't generally measure, however, is the overall impact of low income on physical and mental health.

So what happens when we try? At the Centre for Research on Inner City Health, we analyzed health survey data representative of more than 75,000 Canadian women who had recently given birth. We looked at the relationship between low income and the risk of experiencing three to five of these health conditions at the same time: adverse birth outcomes, postpartum depression, serious abuse, hospitalization during pregnancy and frequent stressful life events.

The results were staggering. We found that new mothers living on very low incomes were more than 20 times more likely to experience multiple health problems than new mothers living on high incomes. Compare this to the "single disease" method through which we often find that people living on low incomes are only twice as likely -- if that -- to experience a specific health problem.

Our evidence also suggests that if we were able to ensure all new mothers in Canada had household incomes of more than $50,000 a year, we could reduce the occurrence of multiple health problems in pregnancy by 60 per cent.

These findings tell us that low income doesn't just lead to one disease or another. Instead, it has wide-ranging impacts on the health of individuals and communities. These findings also tell us that, as researchers, we've been using the wrong tools, and typically underestimating the full impact of income on health.

So now that we have a more accurate assessment of the impact of low income on wellbeing, what kind of solutions do these findings suggest? To some degree, the healthcare system is already recognizing that some populations face multiple health problems. Recent responses have included a much-needed emphasis on case coordination and collaboration between different parts of the system like primary care, hospitals, home care and long-term care. These are good things. Program responses like diabetes education centres and stress reduction classes can be good things too.

The healthcare system, however, is not the only place -- or even necessarily the most important place -- to focus our efforts to improve the health of the population.

Instead, our evidence suggests the incredible potential of focusing our attention on low income itself. If we want to know how to improve the health of Canadians on a large scale, programs and health system changes -- while very important -- are not the answer. The answer is to institute policies that address the social determinants of health, such as education, housing and employment, and change the conditions themselves.

What does this look like in practice? We can start by acknowledging that our health is largely determined by factors that sit outside of the health care system. This is a fact that many people are aware of, but now we have data and some startling numbers to back it up. As a result, we can see that, in a very real sense, social policy is health policy.

As a long-term goal, we should work to foster collaborations between sectors like housing, health and employment, and between levels of government, to coordinate services, and measure health impacts. In the short-term, we must invest in policies that address income. There are many opportunities, from bringing income assistance programs, unemployment benefits and minimum wage in line with the real cost of living, to boosting provincial child benefits to the level needed to make sure all children across the country lead healthy lives.

The evidence shows us that the health of mothers, babies and families are at stake, and there's no more time to lose.

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