Table 8:
Results of multilevel models predicting physical activity (N=149, n=948).
| Null Model | Model 1 | Model 2 | Model 3 | Model 4 | |
|---|---|---|---|---|---|
| γ (SE) | γ (SE) | γ (SE) | γ (SE) | γ (SE) | |
| Fixed effects | |||||
| Intercept | 9.12** (0.166) | 10.61** (0.699) | 9.79** (0.603) | 9.97** (0.533) | 10.19* (0.797) |
| Gender | −0.689 (0.381) | −0.549 (0.361) | −0.537 (0.320) | −0.481 (0.435) | |
| Age at study entry | −0.115* (0.036) | −0.101* (0.031) | −0.114* (0.027) | −0.125* (0.041) | |
| Education | 0.050 (0.075) | 0.050 (0.070) | 0.038 (0.064) | 0.034 (0.082) | |
| Practice effects | −0.585 (0.409) | −1.03* (0.461) | |||
| EF between | 1.05 (1.91) | −1.19 (2.20) | |||
| EF within | 4.94* (2.22) | 6.40* (3.17) | |||
| HRV between | −0.054 (0.155) | −0.115 (0.179) | |||
| HRV within | −0.006 (0.064) | −0.041 (0.099) | |||
| Subjective between | 0.022* (0.009) | 0.034* (0.013) | |||
| Subjective within | 0.012 (0.008) | 0.001 (0.022) | |||
| Random effects | |||||
| Intercept SD | 1.83 | 1.78 | 1.76 | 1.66 | 1.73 |
| Residual SD | 1.89 | 1.90 | 1.89 | 1.90 | 1.91 |
| Model fit | |||||
| LL | −2086.5 | −1000.7 | −1284.5 | −2019.9 | −625.1 |
| AIC | 4179.1 | 2019.3 | 2585.0 | 4055.9 | 1276.2 |
Note. Gender is coded 1=males, 2=females. Results (Models 3 and 4) remain unchanged when excluding the observations that had inconsistent subjective self-regulation scores. EF = executive function; HRV = heart rate variability; LL = log likelihood; AIC =Akaike information criterion.
*
p < .05.
**
p < .001.