Table 3.
Mixed models predicting academic skills from indicators of emotional-behavioral difficulties. (Part 1).
| Reading Comprehension | ||||||
|---|---|---|---|---|---|---|
| Fixed Effects | b | SE | df | t | LLCI | ULCI |
| Intercept | −0.026 | 0.081 | 17.521 | −0.327 | −0.198 | 0.145 |
| Sex | −0.183 * | 0.091 | 430.463 | −2.005 * | −0.364 | −0.003 |
| Conduct problems | 0.023 | 0.079 | 433.894 | 0.293 | −0.132 | 0.178 |
| Hyperactivity | −0.364 *** | 0.071 | 435.062 | −5.127 *** | −0.504 | −0.225 |
| Difficulties with peers | −0.145 * | 0.071 | 426.748 | −2.042 * | −0.286 | −0.005 |
| Emotional difficulties | −0.126 * | 0.060 | 434.678 | −2.081 * | −0.246 | −0.007 |
| Conduct problems X Sex | −0.026 | 0.157 | 431.956 | −0.167 | −0.335 | 0.282 |
| Hyperactivity X Sex | 0.022 | 0.139 | 428.542 | 0.164 | −0.251 | 0.297 |
| Difficulties with peers X Sex | −0.235 † | 0.134 | 423.444 | −1.750 † | −0.499 | 0.028 |
| Emotional difficulties X Sex | 0.017 | 0.116 | 427.573 | 0.150 | −0.210 | 0.245 |
| Random Effects | b | Z Wald | ||||
| Σu | 0.088 * | 1.990 * | ||||
| Σe | 0.816 *** | 14.442 *** | ||||
| Deviance | ||||||
| −2LL (df) | 1224.858 (12) | |||||
| AIC | 1228.858 | |||||
†p < 0.10. * p < 0.05. *** p < 0.001. Note: Sex: male −0.5 and female 0.5; such values allow to interpret the intercept value as referring to a generic child, with no sex assigned. LLCI, lower-level confidence interval (95%); ULCI, upper-level confidence interval (95%). σu: estimate of the residual error variance. σe: estimate of the intercept variance. −2LL: −2 Log likelihood. AIC: Akaike’s Information Criterion.