TABLE 4.
Model fit indices for constraining the unstandardized additive genetic (A), shared environmental (C) and non-shared environmental (E) variance components to be equal for children of low and high educated parents, split by sex
| Males | Females | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Survey | −2LL | χ 2 | Δdf | p-value | −2LL | χ 2 | Δdf | p-value | |
|
Netherlands Twin Register
| |||||||||
| 7 | Full modela | 49321.1 | - | - | - | 49321.1 | - | - | - |
| ACE equal | 49342.3 | 21.2023 | 3 | 9.6e-05 | 49332.95 | 11.8514 | 3 | .0079 | |
| A equal | 49321.14 | .0431 | 1 | .8355 | 49327.63 | 6.5305 | 1 | .0106 | |
| C equal | 49324.09 | 2.9934 | 1 | .0836 | 49321.33 | .2325 | 1 | .6297 | |
| E equal | 49330.68 | 9.5878 | 1 | .0020 | 49329.52 | 8.4230 | 1 | .0037 | |
| 10 | Full model | 63814.18 | - | - | - | 63814.18 | - | - | - |
| ACE equal | 63817.19 | 3.0086 | 3 | .3903 | 63830.40 | 16.2249 | 3 | .0010 | |
| A equal | 63815.25 | 1.0721 | 1 | .3005 | 63823.99 | 9.8151 | 1 | .0017 | |
| C equal | 63814.25 | .0701 | 1 | .7912 | 63815.93 | 1.7513 | 1 | .1857 | |
| E equal | 63814.44 | .2628 | 1 | .6082 | 63824.77 | 10.5922 | 1 | .0011 | |
| 12 | Full model | 115286.6 | - | - | - | 115286.6 | - | - | - |
| ACE equal | 115287.7 | 1.1094 | 3 | .7748 | 115340.6 | 53.9805 | 3 | 1.1e-11 | |
| A equal | 115286.6 | .0004 | 1 | .9835 | 115304.1 | 17.5573 | 1 | 2.8e-05 | |
| C equal | 115286.8 | .2302 | 1 | .6314 | 115291.9 | 5.2743 | 1 | .0216 | |
| E equal | 115286.8 | .1943 | 1 | .6594 | 115333.1 | 46.4837 | 1 | 9.2e-12 | |
| 14 | Full model | 75413.25 | - | - | - | 75413.25 | - | - | - |
| ACE equal | 75432.01 | 18.7622 | 3 | .0003 | 75462.5 | 49.2505 | 3 | 1.2e-10 | |
| A equal | 75414.54 | 1.2905 | 1 | .2560 | 75422.62 | 9.3752 | 1 | .0022 | |
| C equal | 75413.25 | .0024 | 1 | .9607 | 75413.29 | .0452 | 1 | .8317 | |
| E equal | 75413.25 | .0011 | 1 | .9739 | 75442.35 | 29.1015 | 1 | 6.9e-08 | |
| 16 | Full model | 51489.31 | - | - | - | 51489.31 | - | - | - |
| ACE equal | 51509.80 | 20.4875 | 3 | .0001 | 51502.88 | 13.5651 | 3 | .0036 | |
| A equal | 51492.59 | 3.2733 | 1 | .0704 | 51501.79 | 12.4781 | 1 | .0004 | |
| C equal | 51489.47 | .1611 | 1 | .6882 | 51502.76 | 13.4432 | 1 | .0002 | |
| E equal | 51494.41 | 5.1001 | 1 | .0239 | 51490.03 | .7140 | 1 | .3981 | |
| 18 | Full model | 22933.47 | - | - | - | 22933.47 | - | - | - |
| ACE equal | 22936.82 | 3.3488 | 3 | .3409 | 22940.87 | 7.4019 | 3 | .0601 | |
| A equal | 22934.24 | .7744 | 1 | .3789 | 22935.60 | 2.1312 | 1 | .1443 | |
| C equal | 22933.50 | .0339 | 1 | .8540 | 22933.68 | .2127 | 1 | .6446 | |
| E equal | 22935.61 | 2.1406 | 1 | .1434 | 22933.48 | .0129 | 1 | .9097 | |
|
FinnTwin12 | |||||||||
| 12 | Full model | 14383.79 | - | - | - | 14383.79 | - | - | - |
| ACE equal | 14399.29 | 15.5043 | 3 | .0014 | 14385.59 | 1.8028 | 3 | .6143 | |
| A equal | 14384.19 | .4042 | 1 | .5249 | 14384.44 | .6510 | 1 | .4198 | |
| C equal | 14385.07 | 1.2857 | 1 | .2568 | 14384.46 | .6710 | 1 | .4127 | |
| E equal | 14384.87 | 1.0828 | 1 | .2981 | 14383.99 | .2017 | 1 | .6534 | |
| 14 | Full model | 14024.63 | - | - | - | 14024.63 | - | - | - |
| ACE equal | 14030.19 | 5.5637 | 3 | .1349 | 14038.75 | 14.1226 | 3 | .0027 | |
| A equal | 14025.31 | .6893 | 1 | .4064 | 14030.48 | 5.8522 | 1 | .0156 | |
| C equal | 14026.08 | 1.4513 | 1 | .2283 | 14026.77 | 2.1491 | 1 | .1427 | |
| E equal | 14024.69 | .0625 | 1 | .8026 | 14025.96 | 1.3333 | 1 | .2482 | |
| 17 | Full model | 13267.41 | - | - | - | 13267.41 | - | - | - |
| ACE equal | 13277.62 | 10.2019 | 3 | .0169 | 13277.72 | 10.3034 | 3 | .0162 | |
| A equal | 13267.41 | 1.47e-06 | 1 | .9990 | 13268.36 | .9438 | 1 | .3313 | |
| C equal | 13267.45 | .0344 | 1 | .8528 | 13267.96 | .5421 | 1 | .4616 | |
| E equal | 13273.88 | 6.4670 | 1 | .0110 | 13270.71 | 3.2928 | 1 | .0696 | |
|
FinnTwin16 | |||||||||
| 16 | Full model | 16713.28 | - | - | - | 16713.28 | - | - | - |
| ACE equal | 16725.04 | 11.7615 | 3 | .0082 | 16720.99 | 7.7081 | 3 | .0524 | |
| A equal | 16716.38 | 3.0935 | 1 | .0786 | 16713.31 | .0282 | 1 | .8665 | |
| C equal | 16714.57 | 1.2825 | 1 | .2574 | 16713.39 | .1037 | 1 | .7474 | |
| E equal | 16723.59 | 10.3076 | 1 | .0013 | 16715.94 | 2.6574 | 1 | .1031 | |
| 17 | Full model | 15760.69 | - | - | - | 15760.69 | - | - | - |
| ACE equal | 15773.01 | 12.3249 | 3 | .0063 | 15778.14 | 17.4459 | 3 | .0006 | |
| A equal | 15764.20 | 3.5088 | 1 | .0610 | 15766.28 | 5.5907 | 1 | .0181 | |
| C equal | 15762.25 | 1.5564 | 1 | .2122 | 15766.74 | 6.0525 | 1 | .0139 | |
| E equal | 15773.00 | 12.3126 | 1 | .0004 | 15774.21 | 13.5205 | 1 | .0002 | |
| 18 | Full model | 15638.47 | - | - | - | 15638.47 | - | - | - |
| ACE equal | 15642.24 | 3.7706 | 3 | .2873 | 15645.87 | 7.4005 | 3 | .0602 | |
| A equal | 15638.87 | .4028 | 1 | .5256 | 15640.06 | 1.5935 | 1 | .2068 | |
| C equal | 15638.74 | .2720 | 1 | .6020 | 15638.52 | .0501 | 1 | .8229 | |
| E equal | 15641.59 | 3.1229 | 1 | .0772 | 15645.26 | 6.7912 | 1 | .0092 | |
a
The unstandardized variance components were equated simultaneously (ACE) and separately (A, C, E).