Table III:
Model Comparisons for Genetic and Environmental Moderation by Age
| Model | ep | neg 2LL | df | AIC | diff −2LL | diff df | p |
|---|---|---|---|---|---|---|---|
| Full Model: Mean Effects & ACE Variance Moderation | 64 | 64474.09 | 25716 | 13042 | - | - | - |
| Test ACE Moderation for Age | |||||||
| No A Moderation by Age for Females | 62 | 64474.26 | 25718 | 13038 | 0.17 | 2 | 0.919 |
| No C Moderation by Age for Females | 62 | 64477.02 | 25718 | 13041 | 2.93 | 2 | 0.231 |
| No E Moderation by Age for Females | 62 | 64475.30 | 25718 | 13039 | 1.21 | 2 | 0.546 |
| No A Moderation by Age for Males | 62 | 64476.54 | 25718 | 13041 | 2.45 | 2 | 0.294 |
| No C Moderation by Age for Males | 62 | 64474.13 | 25718 | 13038 | 0.04 | 2 | 0.980 |
| No E Moderation by Age for Males | 62 | 64474.71 | 25718 | 13039 | 0.62 | 2 | 0.733 |
| Equate ACE Moderation of Age Across Sex | |||||||
| Equate A Moderation of Age Across Sex | 62 | 64476.95 | 25718 | 13041 | 2.86 | 2 | 0.239 |
| Equate C Moderation of Age Across Sex | 62 | 64475.07 | 25718 | 13039 | 0.98 | 2 | 0.613 |
| Equate E Moderation of Age Across Sex | 62 | 64474.69 | 25718 | 13039 | 0.60 | 2 | 0.741 |
Note: The model described in the results (and displayed Figure 1) is listed in bold font, which included moderation effects of age and education on the genetic (A), shared environmental (C), and nonshared environmental (E) influences on semantic fluency separately for each sex, as well as the phenotypic effects of age and country in each sex on the mean (and independent means for each sex). Moderation of age was evaluated by fixing ACE moderation parameters to zero in each sex. Tests have 2 df because age is allowed to moderate the genetic/environmental paths from education to semantic fluency as well as the unique genetic/environmental influences on semantic fluency.