Supplementary Material for: Treatment Delays and Chance of Reperfusion Therapy in Patients with Acute Stroke: A Danish Nationwide Study

<b><i>Introduction:</i></b> We aimed to determine the treatment delay for ischemic stroke patients in Denmark. <b><i>Methods:</i></b> A nationwide register-based study on acute ischemic stroke patients admitted through emergency medical services. Treatment delay comprised patient, prehospital, and in-hospital delay. Analyses were stratified according to length of prehospital delay (&lt;3 vs. ≥3 h). <b><i>Results:</i></b> A total of 5,356 ischemic stroke episodes were included. The median onset-to-door time was 187 min, and 2,405 (43%) arrived at the stroke unit within 3 h. Overall, the median patient delay was 115 min. For early arrival (<i>n</i> = 2,280), patient delay was 27 min compared to 437 min for late arrivals (<i>n</i> = 2,448). Median prehospital delay varied by 9 min between early- and late-arriving patients. Approximately 48% of the early-arriving patients compared to 9% of the late-arriving patients received i.v. thrombolysis. For thrombectomy, the numbers were 10% and 3%, respectively. This corresponded to an unadjusted relative risk (RR) of 0.18 (95% CI: 0.16–0.21) and adjusted (age, sex, cohabitation status, and stroke severity) RR of 0.20 (95% CI: 0.18–0.23) for i.v. thrombolysis when comparing patients arriving later than 3 h with patients arriving earlier. For thrombectomy, the unadjusted and adjusted RRs were 0.30 (95% CI: 0.23–0.39) and 0.40 (95% CI: 0.31–0.52), respectively. <b><i>Conclusions:</i></b> Patient delay remains the most important barrier for use of reperfusion therapy among acute ischemic stroke patients calling 1-1-2, whereas system delay seems independent of patient delay.