Table 1. Symptom Scores of Healthy Participants Before and After the Administration of Ketamine.
| Psychotic and dissociative symptoms measures (n=19) | Placebo mean (SD) | Ketamine mean (SD) | Wilcoxon signed-ranks Z, P |
|---|---|---|---|
| Brief Psychotic Rating Scale (BPRS) | 7.7 (2.3) | 9.7 (3.7) | −2.53, P=0.011 |
| Rating Scale for Psychotic Symptoms (RSPS) | 2.3 (4.3) | 20.2 (16.8) | −3.55, P<0.001 |
| Clinician Administered Dissociative States Scale (CADSS) | 0.5 (1.2) | 18.2 (16.7) | −3.73, P<0.001 |
| Psychosis-proneness measures (n=16)a | Baseline mean (SD) | — | — |
| Chapman Magical Ideation scale | 3.5 (3.6) | — | — |
| Chapman Perceptual Aberration scale | 4.1 (6.7) | — | — |
| Peters Delusion Inventory | 36.8 (31.1) | — | — |
a
Values for three subjects were not available.