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Characteristics of participants (Mean [±SD]) and methods per study.
| Study number | Demographics | Reference | ||||
|---|---|---|---|---|---|---|
| Sample size (M/F) | Age (years) | Ecstasy/MDMA use (times used in life) | 5-HTTLPR | |||
| S-group (M/F) | L-group (M/F) | |||||
| 1 | 17 (11/6) | 21.0 (1.2) | 17.0 (33.0) | 13 (8/5) | 4 (3/1) | 17 |
| 2 | 15 (9/6) | 21.1 (2.2) | 11.1 (9.9) | 11 (8/3) | 4 (1/3) | 18 |
| 3 | 14 (11/3) | 22.1 (1.9) | 17.0 (12.7) | 12 (10/2) | 2 (1/1) | 5 |
| 4 | 17 (10/7) | 21.1 (2.7) | 18.0 (25.0) | 12 (7/5) | 5 (3/2) | 19 |
