Table 4a.
Common Pathway Model-Fitting Results for the Age of Substance Use Initiation
| Δχ2
|
df
|
p-value
|
AIC
|
|
|---|---|---|---|---|
| Men
| ||||
| I. Full common pathway model | -- | 37 | -- | 37186.58 |
| II. Model I without common C | 3.34 | 38 | .0676 | 37187.92 |
| III. Model I without common A | 3.33 | 38 | .0681 | 37187.91 |
| IV. Model I without common C or A | 55.4 | 39 | <.0001 | 37293.4 |
| V. Model I without specific C | 2.28 | 40 | .5170 | 37187.41 |
| VI. Model I without specific A | 2.47 | 40 | .4809 | 37187.99 |
| VII. Model I without specific C or A | 37.13 | 43 | <.0001 | 37397.37 |
| Women
| ||||
| I. Full common pathway model | -- | 37 | -- | 51406.21 |
| II. Model I without common C | 16.2 | 38 | .0001 | 51420.41 |
| III. Model I without common A | 1.88 | 38 | .1698 | 51406.09 |
| IV. Model III without specific C | 0.50 | 41 | .9735 | 51401.59 |
| V. Model III without specific A | 10.33 | 41 | .0352 | 51431.09 |
Notes. Bold type indicates the best-fitting model. Nested models were compared using the Satorra-Bentler scaled chi-square difference test. A=additive genetic, C=shared environment.