Table 2.
Spearman (r) correlations among variables related to discounting. Sample sizes in this table range from n = 87 to n = 94. Key: FTND = Fagerstrom score for nicotine dependence, CO = carbon monoxide, WCST = Wisconsin Card Sorting Task, BIS = Barratt Impulsivity Scale—11.
| ln(k) money | ln(k) cigarettes | |||
|---|---|---|---|---|
| Amount | $10 | $1,000 | $10 | $1,000 |
| Age | −0.02 | −0.03 | −0.04 | 0.14 |
| IQ | −0.04 | −0.13 | −0.11 | −0.15 |
| Cigarette aquivalence $10 | −0.14 | −0.13 | −0.27** | −0.16 |
| Cigarette equivalence $1000 | 0.08 | −0.12 | 0.13 | 0.00 |
| Fagerstrom’s test for nicotine dependence | 0.13 | 0.13 | 0.09 | −0.03 |
| Breath CO level (unit) | −0.16 | −0.01 | −0.18 | −0.08 |
| Number of quit attempts | 0.06 | 0.00 | 0.08 | 0.11 |
| Cigarettes smoked per day | −0.01 | 0.19 | 0.05 | 0.03 |
| Years of education | −0.11 | −0.29** | −0.29** | −0.31** |
| Utility measure of cigarette reinforcing efficacy | 0.35*** | 0.23* | 0.19 | 0.23* |
| BIS total score | 0.03 | 0.10 | 0.11 | −0.01 |
| BIS nonplanning factor | −0.02 | 0.15 | 0.12 | 0.01 |
| BIS attention factor | 0.11 | 0.04 | 0.16 | 0.00 |
| BIS motor factor | 0.03 | 0.02 | 0.02 | 0.00 |
| WCST: Trials | 0.08 | 0.23* | 0.26* | 0.19 |
| WCST: Total errors | 0.08 | 0.20* | 0.24* | 0.20 |
| WCST: Perseverative errors | 0.13 | 0.24* | 0.26* | 0.19 |
| WCST: Non perseverative errors | 0.03 | 0.18 | 0.21* | 0.21 |
| Stroop: Color name | 0.14 | 0.18 | 0.26* | 0.19 |
| Stroop: Incongruent | 0.05 | 0.19 | 0.17 | 0.19 |
| Stroop: Interference effect | 0.05 | 0.18 | 0.15 | 0.17 |
| Stroop: Word reading | 0.01 | 0.14 | 0.13 | 0.15 |
| Temporal discrimination (average) | −0.01 | 0.25* | 0.21* | 0.12 |
Significance legend
*
p<0.05
**
p<0.01
***
p<0.001
Effect size legend
