Table 1.
Definition of variables and acquisition methods.
| Variable type | Symbol | Description of variable | Acquisition method |
|---|---|---|---|
| Response | C | Binary variable 0 choice of the uncertain alternative 1 choice of the safe alternative | Automatically recorded by the RALT |
| Covariates | up | Uncertainty premium of the safe alternative of a lottery Expected value (x; p)–cash value (y; 1) | Automatically recorded by the RALT |
| p | Probability of the uncertain alternative of a lottery | Automatically recorded by the RALT | |
| coclt | Lifetime amount of cocaine (g) | Drug interview | |
| coceth | Cocaethylene in the hair (pg/mg) | LC-MS/MS analysis of the hair | |
| coctot | Sum of cocaine, and its metabolites benzoylecgonine and norcocaine in the hair (pg/mg) | LC-MS/MS analysis of the hair | |
| age | Biological age (y) | Questionnaire | |
| Factor | SEX | Biological aspects of femaleness/maleness | Questionnaire |
| INC | Cocaine concentration measured in hair Factor 10 controls (no cocaine use) 20 increasing cocaine use 30 decreasing cocaine use 40 steady cocaine use |
LC-MS/MS analysis of the hair | |
| CCQ | Craving for cocaine (score 0–70) | Cocaine Craving Questionnaire | |
| Nuisance covariates | ADHD | Attention deficit hyperactivity disorder symptoms (score 0–54) | ADHD Questionnaire |
| BDI | Symptoms of depression (score 0–63) | Beck Depression Inventory | |
| RVP | Sustained attention (score 0–1) | Rapid Visual Processing task CANTAB | |
| LNST | Verbal working memory (score 0–24) | Letter Number Sequencing Task | |
| RAVLTsum | Verbal declarative memory performance (Σtrials 1–5, score 0–75) | Rey Auditory Verbal Learning Test | |
| RAVLT7 | Verbal declarative memory, delayed recall (score 0–15) | Rey Auditory Verbal Learning Test | |
| SWM | Spatial Working Memory/Executive function (score 1–37) | Spatial Working Memory task CANTAB |
LC-MS/MS, liquid chromatography-tandem mass spectrometry.