Table 1. Comparisons of therapeutic alliance ratings (via the working alliance inventory- short revised) at intervention time-points.

WAI-SR	Preparatory Session 2		1-week post-psilocybin session 2
	M	SD	M	SD	T	p	Cohen’s d
Bond	18.55	1.70	19.29	2.12	1.56	.135	.34
Goal	17.40	3.28	17.79	3.56	.50	.620	.11
Task	14.85	2.80	17.17	3.70	3.99	< .001***	.65
Total	50.80	6.55	54.25	8.27	2.40	.027*	.43

*p < .05,

**p < .01,

***p < .001.

d = .2 (small), d = .5 (medium), d = .8 (large).