Table 1.
Sample Demographic and Baseline Mental Health Characteristics
| Medical air (n = 40) | Nitrous oxide (n = 40) | |
|---|---|---|
| Sex (male:female) | 19:21 | 17:23 |
| Ethnicity (Caucasian:other) | 19:21 | 23:17 |
| Previous N2O (Y:N) | 10:30 | 9:31 |
| Age | 26.09 (4.92) | 23.88 (3.66) |
| Education (years) | 16.75 (2.46) | 16.53 (2.23) |
| DASS-21 (Depression) | 5.95 (6.61) | 4.95 (4.77) |
| DASS-21 (Anxiety) | 4.80 (5.56) | 4.85 (4.59) |
| MDQ (bipolarity) | 4.10 (3.69) | 3.90 (3.81) |
| BIS-11-brief (impulsivity) | 18.43 (2.24) | 19.93 (2.16) |
| AUDIT (alcohol use) | 5.13 (5.17) | 3.58 (2.38) |
| Number of drinks (previous week) | 4.44 (6.07) | 5.59 (8.00) |
Abbreviations: AUDIT, Alcohol Use Disorders Identification Test; BIS-11, Barratt Impulsiveness Scale-11; DASS, Clinician Administered Dissociative Symptoms Scale; MDQ, Mood Disorders Questionnaire; PSI, Psychotomimetic States Inventory.
Values are counts (ethnicity, sex) or means (SDs). Age is based on n = 64 (because of a documentation error, age was not recorded for n = 6 medical air and n = 8 N2O participants).