Table 1. Mortality after middle cerebral artery occlusion.

Period	Group	Dead/total	Rate	Odds ratio (95% CI)	P value
<6 hours	Saline	3/66	4.5
	rtPA	8/89	9.0	2.074 (0.529–8.139)	0.296
<24 hours	Saline	2/43	4.7
	rtPA	23/66	34.8	10.965 (2.430–49.483)	0.002
<72 hours	Saline	2/23	8.7
	rtPA	14/34	41.2	7.350 (1.479–36.520)	0.015

CI, confidence interval; rtPA, recombinant human tissue plasminogen activator.

Mortality rate in the rtPA-treated group was compared with mortality rate in the saline-treated group for each period of reperfusion.