Table 6.
Model Fit, Chi-Square Difference, and change in R2 as predictors were added to the final model.
| −2 × log | BIC | Δx2 | ΔR2 L1 | ΔR2 L2 intercept | ΔR2 L2 slope | |
|---|---|---|---|---|---|---|
| Sex | 3727.2 | 3770.2 | 15.4 | 0.00 | 0.00 | 0.00 |
| Time since waking | 3679.6 | 3728.6 | 47.6 | 0.00 | 0.00 | 0.00 |
| Puberty | 3614.0 | 3669.1 | 65.6 | 0.00 | 0.01 | 0.05 |
| BMI | 3578.1 | 3639.3 | 35.9 | 0.00 | 0.01 | 0.02 |
| Testosterone | 3110.8 | 3177.8 | 467.3 | 0.11 | 0.14 | 0.02 |
| DHEA | 2934.6 | 3007.5 | 176.2 | 0.02 | 0.00 | 0.14 |
| Testosterone*age | 2924.9 | 3004.0 | 9.7 | 0.00 | 0.00 | 0.00 |
| DHEA*age | 2856.7 | 2941.9 | 68.2 | 0.01 | 0.08 | 0.13 |
| Testosterone*puberty | 2850.0 | 2941.2 | 6.7 | 0.00 | 0.01 | 0.00 |
| DHEA*puberty | 2832.8 | 2930.0 | 17.2 | 0.00 | 0.03 | 0.01 |
| Testosterone*sex | 2826.0 | 2929.3 | 6.8 | 0.00 | 0.02 | 0.04 |
| DHEA*sex | 2817.2 | 2926.6 | 8.8 | 0.00 | 0.01 | 0.01 |
| Age*sex | 2805.6 | 2921.2 | 11.6 | 0.00 | 0.01 | 0.00 |
| Puberty*sex | 2802.5 | 2924.1 | 3.1 | 0.00 | 0.00 | 0.00 |
| Age*sex*testosterone | 2799.8 | 2927.4 | 2.7 | 0.00 | 0.00 | 0.00 |
| Age*sex*DHEA | 2798.6 | 2932.3 | 1.2 | 0.00 | 0.00 | 0.00 |
| Puberty*sex*testosterone | 2788.1 | 2927.9 | 10.5 | 0.00 | 0.02 | 0.02 |
| Puberty*sex*DHEA | 2782.7 | 2928.7 | 5.4 | 0.00 | 0.01 | 0.00 |
| R2 | 0.63 | 0.20 | 0.38 |
Note. Cortisol levels collected 30-minutes after waking was the outcome of interest in this model. BIC = Bayesian information criteria; BMI = body mass index; DHEA = dehydroepiandrosterone. Bolded values are statistically significant (p <.05).