Table 1.
Multi-level mixed effects regression
| 1Hours | 1Hours per bout | 3Bouts | |
|---|---|---|---|
| Model 1 | Coefficient (P-value) | Coefficient (P-value) | 4IRR (P-value) |
| Boys | ns | −1.18 (< 0.001) | 1.27 (0.03) |
| Breastfeeding | ns | −0.93 (< 0.001) | 1.27 (< 0.001) |
| 2R2 | 0.02, 0.32, 0.05 | 0.07, 0.21, 0.11 | |
| Model 2 | |||
| Length growth | 0.26 (< 0.001) | ns | 1.05 (0.001) |
| Boys | ns | 1.18 (0.001) | 1.28 (0.03) |
| Breastfeeding | ns | −0.93 (< 0.001) | 1.26 (< 0.001) |
| 2R2 | 0.02, 0.31, 0.05 | 0.07, 0.21, 0.11 | |
| Model 3 | |||
| Length growth | ns | 0.15 (0.05) | ns |
| Boys | ns | −1.29 (< 0.001) | 0.72 (0.02) |
| Breastfeeding | ns | −0.91 (< 0.001) | 1.33 (< 0.001) |
| Sex*Growth | Girls 0.21 (0.15) | Boys 0.27 (0.003) | Girls 0.92 (0.01) |
| 2R2 | 0.02, 0.31, 0.05 | 0.07, 0.20, 0.11 | |
1
xtreg;
2
R2 values within-individual, between-individual, and overall assessed by xtreg;
3
xtpoisson;
4
relative risk (STATA 11). Regressing daily sleep hours, hours per bout, and number of bouts on sex, breastfeeding, and saltatory length growth.