Table 5.

Variances, beta's (β), p values, and 95% confidence intervals (CIs) for the best fitting models for age and NAcc activation (left and right), PDS, testosterone levels, BART, and all scales of the BIS/BAS questionnaire

Varianceβp95% CI
LowerUpper
Nacc L
    Random effect
        Intercept1.010.681.52
    Fixed effects
        Intercept1.730.001.491.96
        Age11.380.59−3.676.43
        Age2−9.440.00−14.42−4.45
Nacc R
    Random effect
        Intercept0.830.501.41
    Fixed effects
        Intercept1.870.001.642.11
        Age10.640.81−4.485.76
        Age2−9.110.00−14.18−4.03
PDS
    Random effect
        Intercept0.300.250.36
    Fixed effects
        Intercept2.690.002.622.77
        Age114.610.0013.2615.97
        Age2−1.520.02−2.75−0.29
        Age3−2.860.00−3.98−1.74
        Sex−0.370.00−0.48−0.27
        Age1 × sex−2.100.04−4.13−0.08
        Age2 × sex2.570.010.714.43
        Age3 × sex1.070.23−0.682.82
Testosterone
    Random effects
        Intercept0.180.150.22
    Fixed effects
        Intercept1.270.001.231.31
        Age13.360.002.264.45
        Age2−1.410.03−2.65−0.17
        Age31.580.000.512.65
        Sex0.740.000.680.81
        Age1 × sex8.250.006.809.70
        Age2 × sex−5.320.00−6.85−3.79
        Age3 × sex−0.440.53−1.810.93
BART
    Random effects
        Intercept5.193.248.32
        Age0.330.200.54
    Fixed effects
        Intercept11.260.0010.9011.62
        Age117.570.008.4426.69
        Age2−16.110.00−24.94−7.27
BIS
    Random effect
        Intercept2.512.182.88
    Fixed effect
        Intercept19.540.0019.1819.90
BAS Drive
    Random effect
        Intercept1.391.181.62
    Fixed effect
        Intercept10.780.0010.5710.99
BAS Fun Seeking
    Random effect
        Intercept0.970.791.19
    Fixed effect
        Intercept11.700.0011.5311.88
BAS Reward
    Random effect
        Intercept1.080.901.30
    Fixed effect
        Intercept17.160.0016.9817.33
  • Linear age terms are represented by Age1, quadratic age terms by Age2, and cubic age terms by Age3.