A change to the Census Bureau survey could affect how they measure the uninsured — and that could impact, and complicate, how the effects of Obamacare are measured.

The new questionnaire — being conducted this month — includes a "total revision" to questions about health insurance, just as analysts are trying to get solid data on how well the Patient Protection and Affordable Care Act is working.

The New York Times reported the change to the annual survey Tuesday, saying the changes are intended to improve the survey's accuracy. However, officials say the new questions are so different that the findings "will not be comparable," leaving many worried about not giving an apples-to-apples comparison to pre and post-reform effects in the uninsured population.

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