Table 2.
Sleep parameter differences (minutes) between estimates from sleep diary and two accelerometer-based methods (N = 25,645 nights, N = 3752 individuals).
| Sleep parameters | HDCZA | L5 ± 6 | ||||
|---|---|---|---|---|---|---|
| Method | Sleep onset time | Waking time | SPT-window duration | Sleep onset time | Waking time | SPT-window duration |
| Y-intercept (SE) | −12.5 (0.9)** | −1.6 (0.8)P = 0.04 | 10.9 (1.1)** | −86.5 (1.0)** | 45.9 (0.9)** | 131.7 (1.2)** |
| Betas (SE) | ||||||
| Women | 5.0 (1.1)** | −3.0 (0.9)* | −8.0 (1.3)** | 8.0 (1.4)** | −8.6 (1.1)** | −16.2(1.6) ** |
| Ten years of age† | 3.9 (0.8)** | −2.9 (0.7)** | −6.8 (1.0)** | 0.3 (1.0) P = 0.78 | 0.2 (0.8) P = 0.83 | −0.2 (1.2) P = 0.89 |
| Five BMI index points‡ | 1.0 (0.5) P = 0.06 | −1.5 (0.5)* | −2.5 (0.7)** | −3.2 (0.7)** | 1.8 (0.6)* | 4.8 (0.8)** |
| Weekend | 3.0 (1.0)* | 2.0 (0.9) P = 0.02 | −1.0 (1.2) P = 0.41 | 6.4 (1.3)** | −0.3 (1.0) P = 0.77 | −6.3 (1.4)** |
| Winter | 1.0 (0.9) P = 0.27 | −1.2 (0.8) P = 0.12 | −2.2 (1.1) P = 0.05 | −1.0 (1.2) P = 0.39 | 0.6 (1.0) P = 0.51 | 1.7 (1.3) P = 0.2 |
| Within individual residual SD | 24.7 | 21.3 | 30.9 | 18 | 13 | 20.6 |
| Between individual residual SD | 66.1 | 56.9 | 82.3 | 88.9 | 74.9 | 101.8 |
| AIC | 81175 | 73538 | 92433 | 94053 | 84956 | 100978 |
Degrees of freedom = 25,645; †Relative to mean age of 69.1 years; ‡Relative to mean BMI of 26.4 kg/m2; SE: Standard Error; SD: Standard Deviation; AIC = Akaike information coefficient, *P < 0.005, **P < 0.0005.