Table 5.
Bivariate genetic modeling results of sleep ratio at 6 and 18 months and language measures at 18, 30, and 60 months
| Parameter estimates |
|||
|---|---|---|---|
| Measure | A | C | E |
| Sleep | |||
| 6-month sleep ratio | 0.64 (0.56-0.71) | n.s. | 0.36 (0.29-0.44) |
| 18-month sleep ratio | n.s. | 0.58 (0.52-0.65) | 0.42(0.35-0.48) |
| Language | |||
| 18-month Language | 0.17 (0.07-0.28) | 0.68 (0.58-0.77) | 0.15 (0.12-0.19) |
| 30-month Language | 0.22 (0.06-0.44) | 0.45 (0.25-0.63) | 0.33 (0.26-0.42) |
| 60-month Language | 0.21 (0.02-0.41) | 0.51 (0.33-0.66) | 0.28 (0.22-0.35) |
| Bivariate models | RG | RC | RE |
| 6-month sleep ratio/18-month language | 0.32 (0.61-0.10) | n.s. | n.s. |
| 6-month sleep ratio/30-month language | 0.33 (1-0.10) | n.s. | n.s. |
| 18-month sleep ratio/60-month language | n.s. | 0.24 (0.41-0.06) | n.s. |
The top panel shows variance parameter estimates with 95% confidence intervals for sleep ratio and language measures. The bottom panel shows the covariance parameter estimates with 95% confidence intervals for significant sleep and language associations.
A, additive genetic parameter; C, shared environmental parameter; E, unique environmental parameter and error; RG, genetic correlation; RC, shared environmental correlation; RE, unique environmental correlation and error. Models include child sex and maternal language other than French or English as control variables.