Fig. 3.

Weekly new stroke cases during the study periods.

Shown are weekly event rates for new acute ischemic stroke diagnoses (blue diamonds), large vessel occlusions (green bubbles), and treatment rate with intravenous thrombolysis (red triangles). Periods highlighted in blue and red indicate the 12-week periods which were used for t-test comparisons, as described in the Methods. Blue, green, and red bars indicate mean event rates during each red or blue study periods.

IV-tPA denotes intravenous tissue plasminogen activator and LVO large vessel occlusion.

12-weeks epochs include; COVID-19 period: 03/01/2020–05/31/2020, seasonal pre-COVID-19 period: 03/01/2019–05/31/2019 and immediate pre-COVID-19 period: 11/01/2019–01/31/2020.