Trial success and futility

	Mean subjects	Mean duration (months)	Total Pr(success)	Probability of early success	Probability of success at final evaluation	Probability of early futility	Probability of futility at final evaluation
Null	39,504	59	0.021	0.020	0.001	0.91	0.074
Alternative	39,400	56	0.93	0.90	0.027	0.016	0.057
One Works	39,537	63	0.75	0.71	0.046	0.091	0.15
Middle	39,634	64	0.75	0.70	0.040	0.091	0.16
Worse	34,755	28	0.00	0.00	0.00	1.00	0.00