The Effectiveness of Medicare Wellness Visits in Accessing Preventive Screening.

The confidence intervals, illustrated as error bars in Figure 4 , suggest the comparisons are highly significant (ie, P < .01), which is to be expected due to the large sample sizes.

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A test of parallel trends across subgroups using statistical interaction tests rejected the hypothesis of parallel trends for all groups; this would be expected given the large sample sizes where even trivial differences may be significant.

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