Oregon gave a subset of people access to healthcare by lottery, so you essentially got a randomized population there with and without access. Massachusetts implemented Romneycare. Both are obvious things for researchers to study. Massachusetts study found an effect on outcomes with improved insurance, the Oregon one did not.
So different conclusions from two conflicting studies? Not at all. The visualization is a simple illustration show that the studies do not conflict--in fact, they happen to agree embarrassingly well. However, the Oregon study was at lower power so could not be reported as finding an effect.
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