Table 4.

Adjusted Intergroup Mean Difference in Primary Outcome and Related Time Intervals

Outcome	Mean Difference Estimate	95% CI	P Value
Dispatch to treatment with tPA	−29.7	−52.5 to −6.9	0.01
Dispatch to ambulance arrival	6.5	2.4–10.5	0.002
Ambulance arrival to treatment with tPA	−36.2	−58.5 to −13.9	0.001

All times in minutes. Conventional care group estimate is subtracted from mobile stroke unit group estimate; model is adjusted for number of designated stroke centers per unit area, population density, and clinical and demographic characteristics. tPA indicates tissue plasminogen activator.