Table 3.
Model fit information for twin variance decomposition models
| Model | Par. | χ2 | df | Δχ2 (ΔDF) | RMSEA | AIC | BIC |
|---|---|---|---|---|---|---|---|
| CE model | 4 | 36,580.02 | 21 | - | 0.143 | 139,257.78 | 139,292.70 |
| AE model | 4 | 1,048.62 | 21 | - | 0.076 | 136,648.38 | 136,683.01 |
| ACE | 5 | 1,004.24 | 20 | 44.38(1)*** | 0.076 | 136,605.99 | 136,649.28 |
| ACE sex-limitation | 8 | 256.27 | 17 | 747.96(3)*** | 0.041 | 135,864.04 | 135,933.29 |
| ACE sex-limit. with additional free means in OSDZ group | 10 | 196.60 | 15 | 59.67(2)*** | 0.038 | 135,808.36 | 135,894.93 |
| ACE sex-limit. with estimated genetic correlation in OSDZ | 11 | 192.25 | 14 | 4.35(1)* | 0.039 | 135,806.01 | 135,901.26 |
| ACE sex-limit. + interaction | 11 | 193.11 | 14 | 3.49(1)† | 0.039 | 135,806.88 | 135,902.10 |
| ACE sex-limit. + sex-specific interactions | 12 | 181.42 | 13 | 11.69(1)*** | 0.039 | 135,797.19 | 135,901.06 |
| ACE sex-limit + 4 interactions: male->male, female- >female, male->female, female->male | 14 | 157.57 | 11 | 23.85(2)*** | 0.040 | 135,777.33 | 135,898.53 |
Lower values of RMSEA, AIC, and BIC indicate better model fit. Δ refers to the change in χ2 and df compared to the previous model. The change in χ2 for nested models follows a χ2 distribution with df equal to the change in df, with significant differences indicating significant improvement in model fit. df, degrees of freedom; Par., parameter.
†
p = .062
*
p = .037
***
p < .001