Table 6.
Final proportional hazards regression results for medical/physical-related attrition.
| Model Fit |
Step 3 Predictor Statistics |
|||||||
|---|---|---|---|---|---|---|---|---|
| Model | df | −2LL | Δ-2LL | Predictor | β | HR | HR 95% LL | HR 95% UL |
| Step 1 | 1 | 142,159.82 | — | AFQT | −0.167 | 0.846 | 0.816 | 0.878 |
| Step 2 | 11 | 141,650.35 | 509.47 | Attention Seeking | −0.048 | 0.953 | 0.927 | 0.979 |
| Step 3 | 15 | 141,609.43 | 40.92 | Dominance | −0.036 | 0.965 | 0.929 | 1.001 |
| Even-tempered | −0.071 | 0.932 | 0.897 | 0.967 | ||||
| Intellectual Efficiency | 0.063 | 1.065 | 1.035 | 1.096 | ||||
| Non-Delinquency | 0.071 | 1.073 | 1.045 | 1.102 | ||||
| Optimism | −0.053 | 0.949 | 0.924 | 0.974 | ||||
| Physical Conditioning | −0.219 | 0.804 | 0.783 | 0.825 | ||||
| Self-Control | −0.037 | 0.964 | 0.938 | 0.990 | ||||
| Selflessness | 0.118 | 1.126 | 1.085 | 1.167 | ||||
| Sociability | 0.059 | 1.061 | 1.032 | 1.090 | ||||
| Time x AFQT | 0.004 | 1.004 | 1.002 | 1.006 | ||||
| Time x Dominance | −0.004 | 0.996 | 0.994 | 0.999 | ||||
| Time x Even-tempered | 0.003 | 1.003 | 1.001 | 1.006 | ||||
| Time x Selflessness | −0.002 | 0.998 | 0.995 | 1.000 | ||||
n = 72,009. −2LL = − 2 log likelihood. β = standardized parameter. HR = Hazard ratio. 95% LL = 95% confidence interval lower limit of the hazard ratio. 95% UL = 95% confidence interval upper limit of the hazard ratio. The Step 1 model includes the AFQT only. The Step 2 model adds the TAPAS scale main effects to the Step 1 model. The Step 3 model adds the interaction terms (i.e., time-varying effects) to the Step 2 model. All models are significant, p < .05. The Step 2 and 3 models resulted in significant change in model fit compared to the previous steps based on a Likelihood Ratio χ2 test, p< .05. Bolded values indicate significant predictor effects, p < .05.