Policy-induced selection bias in pharmacoepidemiology: The example of coverage for Alzheimer's medications in British Columbia.

It was also associated with a change in direction of the slope, from a decreasing trend of −0.8 (95% CI, −0.9 to −0.6) incidence cases per 100 000 person‐months before the policy, to a constant trend of +0.1 (95% CI, −0.1 to 0.2) after the reimbursement policy was implemented (Table 1 and Figure 3 ).

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