Table 1. Results of planned contrasts among four groups: Psilocybin Only, Psilocybin & Other Psychedelics, Non-Psilocybin Psychedelics Only, and No Psychedelics.

Planned contrasts	Outcome variables
	Psychological distress OR (95% CI)	Suicidal thinking OR (95% CI)	Suicidal planning OR (95% CI)	Suicide attempt OR (95% CI)
Psilocybin Only vs. No Psychedelics	.70 (.60-.81)†	.76 (.64–.90)**	.54 (.36–.82)**	.58 (.35–.94)*
Psilocybin Only vs. Psilocybin & Other Psychedelics	.89 (.75–1.05)	.80 (.67–.96)*	.59 (.43–.81)**	.75 (.49–1.14)
Psilocybin Only vs. Non-Psilocybin Psychedelics Only	.76 (.64–.90)**	.89 (.72–1.09)	.83 (.54–1.27)	1.06 (.62–1.80)
Psilocybin Only and Psilocybin & Other Psychedelics vs. No Psychedelics	.74 (.65-.84)†	.85 (.75–.96)*	.70 (.49–1.005)§	.66 (.45–.98)*
Psilocybin Only and Psilocybin & Other Psychedelics vs. Non-Psilocybin Psychedelics Only	.80 (.69–.93)**	.99 (.94–1.16)	1.08 (.76–1.52)	1.22 (.80–1.87)
Psilocybin Only and Psilocybin & Other Psychedelics vs. No Psychedelics and Non-Psilocybin Psychedelics Only	.77 (.68-.87)†	.92 (.80–1.04)	.87 (.63–1.20)	.90 (.63–1.28)

Note. Psilocybin Only: respondents reporting lifetime use of psilocybin but no other classic psychedelic; Psilocybin & Other Psychedelics: respondents reporting lifetime use of psilocybin in addition to other classic psychedelics; Non-Psilocybin Psychedelics Only: respondents reporting lifetime use of any classic psychedelic with the exception of psilocybin; No Psychedelics: respondents reporting no lifetime use of any classic psychedelic substance; Psychological Distress: past month psychological distress; Suicidal Thinking: past year suicidal thinking; Suicidal Planning: past year suicidal planning; Suicide Attempt: past year suicide attempt; OR: weighted odds ratio; CI: confidence interval. Findings in bold are significant.

^§p = .05,

^*p < .05,

^**p < .01,

^†p < .0001.