| Parameter | Effect | Estimate (SE) | 95% CL |
| Baseline | Boys only: M | 0.16 (0.39) | (−0.605, 0.925) |
| Girls only: F | −0.79 (0.353) | (−1.483, −0.098) | |
| Mixed: M | −1.266 (0.122) | (−1.505, −1.026) | |
| Mixed: F | −2.168 (0.174) | (−2.509, −1.827) | |
| Time effect | Boys only: M | −0.018 (0.084) | (−0.183, 0.147) |
| Girls only: F | 0.028 (0.069) | (−0.107, 0.163) | |
| Mixed: M | −0.018 (0.03) | (−0.078, 0.042) | |
| Mixed: F | 0.008 (0.031) | (−0.053, 0.069) |