Table 2.

Mean (±standard error) scores on the CADSS index of dissociative experience

	CADSS overall		CADSS time perception
	K/P	P/K	K/P	P/K
Placebo	0.04 (±0.04)	0.10 (±0.06)	0	0.28 (±0.18)
Ketamine	1.06 (±0.39)	0.32 (±0.13)	1.28 (±0.40)	0.39 (±0.18)

Higher scores represent a greater sense of dissociation and disturbed perception. Overall CADSS score represents the average score of all 27 questions, whereas the time perception subscale is calculated as the mean of the three questions relating specifically to the subjective experience of time. Scores are shown as a function of whether the participant received ketamine in the first session and placebo in the second (K/P) or vice versa (P/K)