Researchers at the University of Sydney say the numbers show a significant disparity in premature death between men and women with kidney failure, the most serious stage of kidney disease.
The disparity in health outcomes between men and women is not uncommon and is an area of growing interest, however, researchers say the difference in health outcomes between women and men in kidney failure exceeds that seen in cardiovascular disease and even cancer.
“The fact we’ve got more women dying from kidney failure before their time than men - that’s what is really crucial. We need to work out the reason for this difference, whether it relates to how people access healthcare, the treatment they get, or biological considerations,” said lead author and biostatistician Dr. Nicole De La Mata.
“The life-years lost for women compared with men are far greater than I have seen for any other health condition, such as cardiovascular disease and cancer,” said senior author Professor Angela Webster from the University of Sydney’s NHMRC Clinical Trials Centre and Centre for Renal and Transplant Research at Westmead Hospital. About the study
The study explored differences among people with kidney failure in Australia and New Zealand by examining health records for over 80,000 people, who identified as either male or female, spanning over 30 years. It drew on the Australian and New Zealand Dialysis and Transplant Registry (ANZDATA). This was then linked to the national death registers which record deaths and their causes in both countries.
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The analysis found women with kidney failure had a higher probability of premature death compared to men with kidney failure – losing on average 3.6 years more life than men. There were also more deaths in women, with 11 times the expected deaths compared to seven times in men.
The impact varied by the age a person experienced kidney failure. Younger women had the greatest loss in life expectancy and survival. A 15-year-old female with kidney failure will lose on average 33 years of life compared to what is expected in the general population, whereas a similar male with kidney failure would lose 27 years. The findings were published in The BMJ.
What sets the study apart from other, similar studies, is that the researchers compared survival to what would be expected in the general population, rather than just between people with kidney failure.
“It tells a more personal story for people with kidney disease; the analysis really illustrates how they are missing out on more years of life, compared to life expectancy in the general population,” said Dr. De La Mata.
In the general population, females live longer than males for many reasons including biology. Other studies have shown chronic kidney disease is more prevalent in women, but men have a faster progression to kidney failure, and men represent most of the population with kidney failure.
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