Table 3.
Univariate model fit indices and parameter estimates (and 95% confidence intervals) for ADHD, ODD and CD symptom, age 9–10 years
| Overall fit | Parameter estimates (95 % CI) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| -2LL | Df | BIC | AIC | χ2 | df | p | A | C | E | A | C | E | |
| Saturated | 1026.08 | 1188 | −3297.53 | ADHD-symptoms | |||||||||
| I: Boys ≠ Girls | |||||||||||||
| rGmf free | 1034.28 | 1196 | −3319.09 | −7.93 | 8.07 | 8 | .43 | ||||||
| II: Boys ≠ Girls | |||||||||||||
| rCmf free | 1034.35 | 1196 | −3319.05 | 7.73 | 8.27 | 8 | .41 | ||||||
| III: Boys ≠ Girls | |||||||||||||
| rGmf, rCmf fixed | 1034.35 | 1197 | −3322.26 | −9.73 | 8.27 | 9 | .51 | ||||||
| IV: Boys = Girls | |||||||||||||
| 1034.53 | 1200 | −3331.79 | −15.55 | 8.45 | 12 | .75 | .61 (.46–.68) | .00 (.00–.13) | .39 (.32–.46) | Same as males | |||
| Saturated | 433.072 | 1189 | −3597.24 | ODD-symptoms | |||||||||
| I: Boys ≠ Girls | |||||||||||||
| rGmf free | 437.10 | 1197 | −3620.89 | −11.97 | 4.03 | 8 | .85 | ||||||
| II: Boys ≠ Girls | |||||||||||||
| rCmf free | 437.06 | 1197 | −3620.90 | −12.01 | 3.99 | 8 | .86 | ||||||
| III: Boys ≠ Girls | |||||||||||||
| rGmf, rCmf fixed | 437.10 | 1198 | −3624.09 | −13.97 | 4.03 | 9 | .91 | ||||||
| IV: Boys = Girls | |||||||||||||
| 438.17 | 1201 | −3633.18 | −18.90 | 5.10 | 12 | .95 | .34 (.13–.56) | .25 (.06–.43) | .41 (.34–.48) | Same as males | |||
| Saturated | 84.18 | 1192 | −3783.26 | CD-symptoms | |||||||||
| I: Boys ≠ Girls | |||||||||||||
| rGmf free | 94.56 | 1200 | −3803.74 | −5.62 | 10.38 | 8 | .24 | .39 (.12–.70) | .32 (.03–.56) | .28 (.22–.37) | .44 (.17–.74) | .26 (.00–.50) | .30 (.23–.39) |
| II: Boys ≠ Girls | |||||||||||||
| rCmf free | 99.19 | 1200 | −3801.42 | −0.99 | 15.01 | 8 | .06 | ||||||
| III: Boys ≠ Girls | |||||||||||||
| rGmf, rCmf fixed | 97.64 | 1201 | −3805.41 | −4.54 | 13.46 | 9 | .14 | ||||||
| IV: Boys = Girls | |||||||||||||
| 114.32 | 1204 | −3806.69 | 6.14 | 30.14 | 12 | .003 | |||||||
| IVa: Boys = Girls | |||||||||||||
| rGmf free | 107.23 | 1203 | −3807.03 | 1.05 | 23.05 | 11 | .017 | ||||||
Note. Model I: estimates different variance components and different genetic effects in the sexes; Model II: estimates different variance components and different shared environmental effects in the sexes; Model III: estimates different variance components in the sexes; Model IV: estimates same variance components in both sexes; Model IVa (fit only for CD symptoms) estimates different genetic effects but with equal magnitude of variance components in both sexes. Models I thru IVa are compared to the saturated covariance model in each case. A = variance due to additive genetic influences; C = variance due to shared environmental influences; E = variance due to non-shared environmental influences.