Table 3.
Estimated parameters for fixed effects from the regression mixed model
| Fixed effects | Coefficient estimate |
SE | df | t value |
Pr > |t| |
|---|---|---|---|---|---|
| SIQ-JR | |||||
| Intercept | 44.9 | 1.1 | 426 | 39.5 | <.001 |
| Male vs. female | −3.3 | 1.2 | 426 | −2.7 | .008 |
| Bully vs. non-bully | 6.6 | 2.8 | 426 | 2.4 | .02 |
| Multiple attempt | 3.9 | 1.1 | 426 | 3.4 | .0007 |
| Centered baseline BHS score | .9 | .1 | 426 | 9.4 | <.0001 |
| t1a | −17.8 | 1.3 | 1,307 | −14.2 | <.0001 |
| t2 | 12.4 | 1.9 | 1,307 | 6.4 | <.0001 |
| t3 | 4.6 | 1.1 | 1,307 | 4.2 | <.0001 |
| t1*Bully | −9.3 | 3.7 | 1,307 | −2.5 | .01 |
| t2*Bully | 12.5 | 5.8 | 1,307 | 2.2 | .03 |
| t3*Bully | −3.5 | 3.2 | 1,307 | −1.1 | .28 |
| BHS | |||||
| Intercept | 8.6 | .27 | 426 | 32.2 | <.0001 |
| Bully vs. non-bully | .75 | .76 | 426 | .99 | .32 |
| Centered Baseline SIQ-JR Score | .07 | .01 | 426 | 7.2 | <.0001 |
| Centered Baseline CDRS-R Score | .03 | .02 | 426 | 1.97 | .049 |
| t1 | −1.2 | .34 | 1,309 | −3.5 | .0006 |
| t2 | .16 | .52 | 1,309 | .31 | .76 |
| t3 | .45 | .34 | 1,309 | 1.3 | .18 |
| t4 | .42 | .18 | 1,309 | 2.4 | .02 |
| t1*Bully | −1.9 | .99 | 1,309 | −1.9 | .06 |
| t2*Bully | 3.5 | 1.5 | 1,309 | 2.3 | .02 |
| t3*Bully | −2.2 | .99 | 1,309 | −2.2 | .03 |
| t4*Bully | .81 | .51 | 1,309 | 1.6 | .11 |
| CDRS-R | |||||
| Intercept | 63.6 | 1.2 | 397 | 52.6 | <.0001 |
| Male vs. female | −2.5 | .8 | 397 | –3.0 | .003 |
| Bully vs. non-bully | −.09 | 1.2 | 397 | −.76 | .4 |
| Centered Baseline SIQ-JR Score | −.09 | .02 | 397 | 4.1 | <.0001 |
| Centered Baseline BHS Score | .30 | .07 | 397 | 4.1 | <.0001 |
| Centered Baseline CAFAS Score | .03 | .01 | 397 | 3.0 | .003 |
| Centered Baseline MASC Score | .11 | .02 | 397 | 5.3 | <.0001 |
| t1 | −20.8 | .75 | 1,269 | −27.6 | <.0001 |
| t2 | 18.8 | .90 | 1,269 | 21.0 | <.0001 |
| t3 | 1.8 | .38 | 1,269 | 4.8 | <.0001 |
| CAFAS | |||||
| Intercept | 87.5 | 6.3 | 410 | 13.8 | <.0001 |
| Site | 7.7 | 3.4 | 306 | 2.3 | .02 |
| Bully vs. non-bully | 15.4 | 4.6 | 306 | 3.4 | <.0001 |
| Multiple attempt | 8.7 | 3.1 | 306 | 2.8 | .005 |
| t1 | −19.7 | 1.0 | 306 | −19.2 | <.0001 |
| t2 | 18.0 | 1.2 | 306 | 14.5 | <.0001 |
| MASC | |||||
| Intercept | 45.9 | .89 | 426 | 51.8 | <.001 |
| Bully vs. non-bully | −.08 | 2.5 | 306 | −.03 | 1.0 |
| Centered Baseline SIQ-JR Score | .14 | .04 | 306 | 3.8 | .0002 |
| Centered Baseline CDR Score | .3 | .06 | 306 | 5.5 | <.0001 |
| t1 | −1.0 | .46 | 306 | −2.2 | .03 |
| t2 | −07 | .56 | 306 | −.14 | .9 |
| t1*Bully | −3.9 | 1.3 | 306 | −2.9 | .003 |
| t2*Bully | 4.3 | 1.6 | 306 | 2.7 | .007 |
| PESQ | |||||
| Intercept | 30.9 | .99 | 401 | 31.1 | <.001 |
| Tx group | −2.1 | .98 | 401 | −2.1 | .03 |
| Multiple attempts | −3.6 | 1.0 | 401 | −3.6 | .0004 |
| Bully vs. non-bully | 4.8 | 1.7 | 401 | 2.8 | .005 |
| Centered Baseline CAFAS Score | .04 | .01 | 401 | 3.0 | .003 |
| t1 | −.49 | .24 | 661 | −2.0 | .047 |
| t2 | .6 | .30 | 661 | 2.1 | .04 |
| t1*Bully | −1.9 | .72 | 661 | −2.7 | .007 |
| t2*Bully | 1.4 | .86 | 661 | 1.6 | .11 |
BHS = Beck’s Hopelessness Scale; CAFAS = Child and Adolescent Functional Assessment Scale; CDRS-R = Children’s Depression Rating Scale - Revised; MASC = Multidimensional Anxiety Scale for Children; PESQ = Personal Experience Screening Questionnaire; SIQ-JR = Suicide Ideation Questionnaire – Junior; Tx = treatment.
a
The choice of using coded time t1, t2, t3 or t4 in each of 6 models was based on the non-linear pattern of the observed trends over time.