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	39,557	59	0.022	0.018	0.004	0.90	0.081
Alternative	39,395	56	0.91	0.89	0.023	0.01	0.078
One Works	39,658	66	0.79	0.73	0.057	0.094	0.12
Middle	39,641	66	0.76	0.71	0.049	0.09	0.15
Worse	34,683	29	0.00	0	0	1	0