Table 2.

Prevalence of Unrealistic Optimism with Respect to Various Events among Patients Enrolling in Early-Phase Oncology Trials

	Percent of participants demonstrating unrealistic optimism	Mean	Standard deviation	t value	p value	Cohen’s d
Compared with other trial participants how likely are you to
Have your cancer cured by standard drugs?	26.4	−0.17	1.67	−0.86	NS	−0.207
Have you cancer controlled by the drugs in the trial?	59.7	1.00	1.18	7.22	p < 0.050	1.714
Experience a health benefit from the drugs in the trial?	62.5	1.04	1.22	7.27	p < 0.001	1.726
Experience a health problem from the drugs in the trial?	38.9	−0.37	1.24	−2.57	p < 0.050	−0.610
Have your cancer cured by the drugs in the trial?	40.3	0.17	1.62	0.88	NS	0.210