Doctor Murray says lower fertility rates around the world, combined with higher earnings, are also reducing deaths.
The nations found to have the biggest reductions were Egypt, Ecuador and Bolivia. The researchers say China also had a sharp drop.
But since nineteen ninety maternal death rates have risen in some countries. Zimbabwe, for example, had a five and one-half percent increase per year. Afghanistan, India, Pakistan, Nigeria, the Democratic Republic of Congo and Ethiopia also had increases.
H.I.V. has slowed the progress in reducing maternal deaths. The study linked almost one in every five such deaths in two thousand eight to the virus that causes AIDS.
The researchers say maternal deaths rates have also increased in some wealthy countries. They found the number in the United States rose almost forty-two percent since nineteen ninety. Countries such as Canada and Norway also had increases. Doctor Murray says at least part of the increase is likely the result of better record keeping.
The study also included the University of Queensland in Australia. The report is in the Lancet.
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25