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. 2018 May 1;90(18):e1561–e1569. doi: 10.1212/WNL.0000000000005419

Figure 2. Changes in the number and rate of US ischemic stroke and TIA transfers, 2006–2014.

Figure 2

(A) The number of acute care transfers over time is estimated using sampling weights and strata from the nationwide emergency department (ED) sample, which is an approximate 20% sample of US ED visits. (B) To correct for double-counting, the rate denominator includes nontransferred patient visits only.