(MSN Money) With many Americans and businesses concerned about the impact of Obamacare, a new study from the country’s top group of financial risk analysts is providing fodder for those fears.

Underlying claims costs — which form the basis for insurers’ health care coverage premiums — will jump by one-third across the U.S. after the Affordable Care Act goes into effect next year, according to the Society of Actuaries.

But that increase won’t be felt evenly across the country because the study forecasts that some states will feel more pain than others. Among the hardest-hit will be Ohio, where claims costs will jump by almost 81%, and California, with a 62% increase.

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