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Millions of Americans gained health insurance coverage under the Patient Protection and Affordable Care Act this year, but the influx apparently has not yet translated into patients packing doctors' offices. That may reflect a lack of understanding about how and where to seek care-and a lack of outreach by their new plans and providers. "If coverage expansion is allowing patients to establish new relationships with physicians, we would expect to see physicians devote a greater share of their calendars and work effort to caring for new patients," wrote the authors of a report released this week by the Robert Wood Johnson Foundation and Athenahealth, a company that sells cloud-based health information and practice management technology. But that is not what they found. Though it may seem counterintuitive, the organizations discovered that during the first five months of 2014, all specialties-with the exception of pediatrics-experienced lower rates of new-patient visits than they had in the year-ago period. This was based on data taken from more than 14,000 providers across specialties. For example, the proportion of visits from new patients to primary-care physicians in the sample from January to May 2014 was 18.8% compared with 19.3% during that same five-month period in 2013. The study did not analyze what caused this decline, but the authors suggest that one reason is that the newly insured are continuing to go to emergency departments instead of physician offices. That explanation seems consistent with studies that showed increased emergency department use after pre-ACA expansions of health insurance in Massachusetts and Medicaid in Oregon.

Starting a business is risky enough in the best of circumstances. Most new ventures fail, and the prospect of forgoing a salary is enough to keep many would-be entrepreneurs from taking the plunge. But think about how much harder it would be if your child had a health condition, and you couldn't get her insurance if you struck out on your own. That's less of a problem in the U.S. than it was a few years ago, thanks to Obamacare, but until recently it was a very real conundrum. So does the extension of publicly provisioned health insurance prompt more people to start companies? That's the question asked by a paper released earlier this year by Gareth Olds of Harvard Business School. Olds analyzed Census data from before and after the passage of the Children's Health Insurance Program in the U.S. in 1997 to assess its impact on entrepreneurship. CHIP, or SCHIP as it was previously known, provides publicly funded health insurance to children whose families don't qualify for Medicare, but whose incomes still fall below a cutoff (typically around 200% of the federal poverty line). His results suggest that the policy did significantly increase business creation by those families affected. The self-employment rate for CHIP recipients increased from just under 15% of those eligible to over 18%. That amounts to an a 23% increase. The rate of ownership of incorporated businesses - a better proxy for sustainable, growth entrepreneurship - increased even more dramatically, from 4.3% to 5.8%, an increase of 31%. What about all the other factors that might skew this sort of analysis? Olds used several quasi-experimental statistical methods in his research to control for such variables. The basic intuition behind his methods is that a family just above the CHIP cutoff isn't all that different from a family just below it. Whether you make 199% of the poverty line or 201% doesn't matter for much, except whether or not you'll be able to enroll in the program.