Table 2.

Proportion of Deaths Among 6,269 Ischemic Stroke Patients Registered in a German Stroke Registry Between 2000 and 2001 Who Were Treated or Not Treated With Tissue Plasminogen Activator, According to Percentiles of the Propensity Score for the Entire Study Population

Percentile	Treated (n = 212)				Not treated (n = 6,057)				Empirical OR*
	Score†	No.	Deaths		Score†	No.	Deaths
			No.	%.			No.	%.
99 to 100	0.5809	36	3	8.3	0.5474	26	7	26.9	0.25
95 to <99	0.3143	73	13	17.8	0.2912	178	27	15.2	1.21
90 to <95	0.1393	55	8	14.6	0.1363	258	19	7.4	2.14
75 to <90	0.0585	31	3	9.7	0.0459	910	82	9.0	1.08
50 to <75	0.0115	10	4	40.0	0.0084	1,558	87	5.6	11.27
25 to <50	0.0017	5	2	40.0	0.0014	1,561	54	3.5	18.60
10 to <25	0.0004	2	1	50.0	0.000267	940	36	3.8	25.11
5 to <10		0	0	0	0.000066	313	6	1.9
1 to <5		0	0	0	0.000027	251	8	3.2
0 to <1		0	0	0	0.000007	62	1	1.6
Overall	0.2521	212	34	16.0	0.0262	6057	327	5.4	3.35

^*Propensity-stratum-specific-treatment-mortality odds ratio.

^†Mean propensity score in percentile.

This table illustrates that the odds ratio (OR) varies inversely with the propensity of being treated, that is, individuals with a lower propensity score had higher odds of mortality (40).

(Table title and body reproduced from Tobias Kurth, Alexander M. Walker, Robert J. Glynn, K. Arnold Chan, J. Michael Gaziano, Klaus Berger, James M. Robins, Results of multivariable logistic regression, propensity matching, propensity adjustment, and propensity-based weighting under conditions of nonuniform effect, American Journal of Epidemiology [Johns Hopkins Bloomberg School of Public Health in association with the Society for Epidemiologic Research], 2006, Volume 163, Issue 3, Pages 262–270, by permission of Oxford University Press.)