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The unit of analysis for the Medicare claims data analysis is the individual physicians affiliated with the MRI treatment practices and the matched non-MRI comparison practices.
While this antitrust ruling only applies to Google's Android-related business practices to Russia, the European competition commission is also considering similar charges against Android in Europe as a whole — in addition to formally probing the company's search comparison practices.
The claims analysis focused on the change in Medicare MRI volume one-year post-onsite-MRI-acquisition and one-year pre-onsite-MRI-acquisition for physicians in MRI practices relative to physicians in the non-MRI comparison practices.
By imposing this PS caliper restriction, 23 MRI practices and 23 matched non-MRI comparison practices were identified, with a total of 252 and 181 affiliated providers, respectively (Table 2).
For physicians in the matched non-MRI comparison practices, the MRI acquisition year for the matched MRI practice (t) is used as a pseudo-MRI year to define the pre- and post-MRI-year volume of MRI exams.
Multivariate regression models were used to examine the change in Medicare MRIs per Medicare patient one year before and one year after the onsite MRI acquisition year for providers in MRI practices compared to providers in non-MRI comparison practices.
Similar(27)
In this case, because MRI practices are fundamentally different from non-MRI practices in terms of a key practice characteristic (specifically, practice size), restricting the matching of non-MRI practices to comparable MRI practices based on an exact or near exact PS would have resulted in a very small sample of matched case-comparison practices.
We extracted the key variables associated with the questionnaire or required to make comparisons: practice identifier, age and gender, BP, significant proteinuria, CKD (strictly applying a standard for chronicity), diabetes (again using strict diagnostic criteria) [ 23] or hypertension.
The intervention and comparison group practices did not differ remarkably in comparison to general medical practice characteristics.
Table 2 shows the comparison between practices with or without a tropical GP on the 26 aspects of practice management.
By comparison, such practices are explicitly forbidden to members of the U.S. Congress.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com