Table 3.
Statistical Parameters (Regression Coefficients [b], Significance Level (p), and 95%‐Confidence Interval for the bs) for the Best Fitting Models Testing the Relation Between Age and Each of the Measures Reported in the Table
| Dependent variable | Fixed effects | b | p | 95% Confidence interval β | |
|---|---|---|---|---|---|
| Min | Max | ||||
| Left NAcc win > lose | Intercept | 1.65 | < .001 | 1.43 | 1.87 |
| Age, 1 | −0.01 | .62 | −0.06 | 0.04 | |
| Age, 2 | −0.01 | < .001 | −0.02 | −0.01 | |
| Right NAcc win > lose | Intercept | 1.78 | < .001 | 1.56 | 2.00 |
| Age, 1 | −0.02 | .50 | −0.06 | 0.03 | |
| Age, 2 | −0.02 | < .001 | −0.02 | −0.01 | |
| Pleasure from winning versus losing | Intercept | 4.31 | < .001 | 3.96 | 4.62 |
| Age, 1 | −0.14 | < .001 | 0.08 | 0.20 | |
| Sex | 0.87 | < .001 | 0.36 | 1.36 | |
| BAS Drive | Intercept | 10.99 | < .001 | 10.66 | 11.31 |
| Age, 1 | 0.13 | .01 | 0.03 | 0.23 | |
| Age, 2 | 0.00 | .61 | −0.02 | 0.01 | |
| Age, 3 | 0.00 | .72 | 0.00 | 0.00 | |
| Sex | −0.31 | .20 | −0.77 | 0.16 | |
| Age, 1 × Sex | −0.04 | .54 | −0.19 | 0.10 | |
| Age, 2 × Sex | 0.02 | .05 | −0.04 | 0.00 | |
| Age, 3 × Sex | 0.00 | .13 | 0.00 | 0.00 | |
| BAS Fun Seeking | Intercept | 11.56 | < .001 | 11.37 | 11.76 |
| Age, 1 | 0.07 | .02 | 0.01 | 0.13 | |
| Age, 2 | 0.01 | .01 | 0.00 | 0.02 | |
| Age, 3 | 0.00 | < .01 | 0.00 | 0.00 | |
| BAS Reward Responsiveness | Intercept | 17.25 | < .001 | 17.00 | 17.50 |
| Age, 1 | 0.07 | .02 | 0.01 | 0.13 | |
| Age, 2 | 0.01 | .07 | 0.00 | 0.02 | |
| Age, 3 | 0.00 | .02 | 0.00 | 0.00 | |
| Sex | −0.41 | .01 | −0.74 | −0.09 | |
Linear age terms are represented by “Age, 1,” quadratic terms by “Age, 2,” and cubic terms by “Age, 3.” BAS = Behavioral Activation System; NAcc = nucleus accumbens.