Table 3.
Model-fitting results for univariate models, and proportions of variance (parameter estimates) explained by additive genetic influences (A), shared-environmental (C) and residual variation (E) with 95% confidence intervals (CI).
| Goodness-of-fit index | Parameter estimates (CI = 95%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||
| Model | −2LL | df | AIC | ΔX2 | Δdf | p | A | C/D | E | |
| Breakfast timing | ACE | 258.11 | 101 | 56.11 | - | 0.53 (0, 0.74) | 0.02 (0, 0.59) | 0.45 (0.26, 0.74) | ||
| AE | 258.12 | 102 | 54.12 | 0.003 | 1 | .954 | 0.56 (0.28, 0.74) | -- | 0.44 (0.26, 0.72) | |
| CE | 259.78 | 102 | 55.78 | 1.67 | 1 | .196 | 1 | |||
| E | 271.01 | 103 | 65.01 | 12.89 | 1 | < .001 | 1 | |||
|
| ||||||||||
| Lunch timing | ADE | 155.69 | 101 | −46.31 | 0.21 (0, 0.62) | 0.19 (0, 0.63) | 0.60 (0.37, 0.92) | |||
| AE | 155.74 | 102 | −48.26 | 0.05 | 1 | .830 | 0.38 (0.07, 0.62) | -- | 0.62 (0.38, 0.93) | |
| E | 161.46 | 103 | −44.54 | 5.72 | 1 | .017 | 1 | |||
|
| ||||||||||
| Dinner timing | ACE | 205.29 | 101 | 3.29 | - | 0 (0, 0.60) | 0.39 (0, 0.60) | 0.61 (0.37, 0.86) | ||
| AE | 206.97 | 102 | 2.97 | 1.68 | 1 | .195 | 1 | |||
| CE | 205.29 | 102 | 1.29 | < 0.01 | 1 | 1 | -- | 0.39 (0.14, 0.59) | 0.61 (0.40, 0.86) | |
| E | 214.17 | 103 | 8.17 | 8.88 | 1 | .003 | 1 | |||
|
| ||||||||||
| Midpoint of food intake | ADE | 168.56 | 101 | −33.44 | 0.57 (0, 0.79) | 0.07 (0, 0.85) | 0.36 (0.21, 0.60) | |||
| AE | 168.57 | 102 | −35.43 | 0.008 | 1 | .930 | 0.64 (0.40, 0.79) | -- | 0.36 (0.21, 0.60) | |
| E | 187.79 | 103 | −18.21 | 19.225 | 1 | <.0001 | - | - | 1 | |
|
| ||||||||||
| Wake timing | ACE | 299.92 | 101 | 97.92 | - | 0.34 (0, 0.72) | 0.20 (0, 0.64) | 0.46 (0.27, 0.73) | ||
| AE | 300.17 | 102 | 96.17 | 0.25 | 1 | .618 | 0.55 (0.29, 0.73) | -- | 0.45 (0.27, 0.70) | |
| CE | 300.64 | 102 | 96.64 | 0.72 | 1 | .395 | 1 | |||
| E | 314.24 | 103 | 108.24 | 14.08 | 1 | < .001 | 1 | |||
|
| ||||||||||
| Bed timing | ADE | 287.83 | 101 | 85.83 | 0 (0, 0.61) | 0.42 (0, 0.65) | 0.58 (0.35, 0.91) | |||
| AE | 288.44 | 102 | 84.44 | 0.61 | 1 | .436 | 0.38 (0.06, 0.63) | -- | 0.62 (0.37, 0.94) | |
| E | 293.80 | 103 | 87.80 | 5.36 | 1 | .021 | 1 | |||
|
| ||||||||||
| Chronotype | ACE | 729.27 | 101 | 527.27 | - | 0.38 (0, 0.64) | 0.04 (0, 0.55) | 0.58 (0.35, 0.88) | ||
| AE | 729.28 | 102 | 525.28 | 0.01 | 1 | .922 | 0.43 (0.13, 0.64) | -- | 0.57 (0.35, 0.86) | |
| CE | 729.90 | 102 | 525.90 | 0.62 | 1 | .430 | 1 | |||
| E | 736.99 | 103 | 530.99 | 7.09 | 1 | .008 | 1 | |||
−2LL: twice negative log-likelihood; df: degrees of freedom; AIC: Akaike Information Criterion; ΔX2: difference in X2 to full model; Δdf: difference in degrees of freedom to full model. Bold values indicate best fitting model.