Table 3.
Item factor loadings, residual variances, and heritability estimates (95% confidence intervals)
| Residual variance |
|||||||
|---|---|---|---|---|---|---|---|
| Item | Factor loading | A | C | E | Total heritability | Total common environment | Total unique environment |
| 1. Ever had eating binges | 0.65 (0.51–0.76) | 0.01 | 0.21 | 0.65 | 0.34 (0.21–0.53) | 0.12 (0.00–0.31) | 0.54 (0.39–0.74) |
| 2. Eating out of control during binges | 0.74 (0.56–0.82) | 0.12 | 0.09 | 0.79 | 0.39 (0.25–0.71) | 0.04 (0.00–0.18) | 0.57 (0.26–0.75) |
| 3. Frequency of binges per month | 0.75 (0.51–0.88) | 0.17 | 0.12 | 0.71 | 0.41 (0.23–0.67) | 0.06 (0.00–0.22) | 0.53 (0.25–0.74) |
| 4. Duration of binge eating episodes | 0.55 (0.23–0.74) | 0.16 | 0.27 | 0.58 | 0.30 (0.11–0.71) | 0.19 (0.00–0.64) | 0.52 (0.13–0.80) |
| 5. Vomiting | 0.75 (0.59–0.85) | 0.40 | 0.32 | 0.28 | 0.53 (0.41–0.74) | 0.14 (0.00–0.24) | 0.33 (0.22–0.48) |
| 6. Laxatives | 0.82 (0.71–0.88) | 0.03 | 0.06 | 0.91 | 0.43 (0.21–0.54) | 0.02 (0.00–0.12) | 0.55 (0.39–0.79) |
| 7. Diuretics | 0.67 (0.53–0.78) | 0.30 | 0.07 | 0.65 | 0.44 (0.23–0.62) | 0.03 (0.00–0.22) | 0.53 (0.36–0.74) |
| 8. Diet pills | 0.66 (0.55–0.72) | 0.43 | 0.00 | 0.57 | 0.51 (0.23–0.62) | 0.00 (0.00–0.09) | 0.49 (0.38–0.77) |
| 9. Excessive exercise | 0.51 (0.36–0.61) | 0.25 | 0.17 | 0.58 | 0.35 (0.13–0.60) | 0.12 (0.00–0.32) | 0.53 (0.38–0.70) |
| 10. Fasting | 0.68 (0.54–0.77) | 0.25 | 0.20 | 0.55 | 0.42 (0.20–0.62) | 0.11 (0.00–0.27) | 0.47 (0.34–0.65) |
| 11. Importance of weight/shape to self-evaluation | 0.44 (0.32–0.55) | 0.14 | 0.69 | 0.69 | 0.24 (0.10–0.46) | 0.13 (0.00–0.28) | 0.63 (0.53–0.75) |
A, Additive genetic influence on the latent trait; C, common environmental influence on the latent trait; E, unique environmental influence on the latent trait.