Table 4.
Twin Model Parameter Estimates and Model Fitting Results for Alcohol Involvement and Eating Disorder Symptoms in Girls
| Alcohol Involvement Parameter Estimates |
Eating Disorder Symptom Parameter Estimates |
Fit-Statistics |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Model | a2 | c2 | e2 | a2 | c2 | e2 | −2lnL | Df | χ2 diff (p) |
AIC |
| Alcohol Use in Last Month | ||||||||||
| Drive for Thinness | ||||||||||
| ACE | 47 (14;80) |
29 (0;57) |
25 (17;35) |
56 (17;76) |
12 (0;45) |
32 (22;44) |
2906.50 | 1563 | -- | −220.00 |
| AE |
77 (67;83) |
-- |
23 (16;33) |
69 (58;78) |
-- |
31 (22;42) |
2910.20 | 1566 |
3.70 (.30) |
−222.00 |
| CE | -- | 65 (55;73) |
35 (27;45) |
-- | 56 (45;65) |
44 (35;55) |
2922.20 | 1566 | 16.00 (<.01) |
−210.00 |
| AE-no a21 | 75 (65;82) |
-- | 25 (18;35) |
67 (55;77) |
-- | 33 (23;45) |
2930.00 | 1567 | 16.00 (<.001) |
−208.00 |
| AE-no a22 | 65 (50;77) |
-- | 35 (23;51) |
32 (16;50) |
-- | 68 (51;84) |
2971.00 | 1567 | 60.01 (<.001) |
−163.23 |
| Body Dissatisfaction | ||||||||||
| ACE | 46 (14;81) |
30 (9;58) |
24 (16;34) |
81 (46;90) |
3 (0;37) |
15 (11;22) |
3064.00 | 1564 | -- | −64.10 |
| AE |
77 (68;84) |
-- |
23 (16;32) |
85 (78;90) |
-- |
15 (11;22) |
3067.10 | 11567 |
3.20 (.37) |
−67.00 |
| CE | -- | 66 (57;74) |
31 (26;43) |
-- | 70 (61;77) |
30 (23;39) |
3096.50 | 1567 | 33.00 (<.001) |
−38.00 |
| AE-no a21 | 75 (66;83) |
-- | 25 (17;34) |
84 (77;90) |
-- | 16 (11;23) |
3084.00 | 1568 | 17.00 (<.001) |
−52.10 |
| AE-no a22 | 50 (20;70) |
-- | 50 (30;72) |
64 (30;80) |
-- | 36 (20;62) |
3158.03 | 1568 | 91.00 (<.001) |
22.03 |
| Ever Intoxicated from Alcohol | ||||||||||
| Drive for Thinness | ||||||||||
| ACE | 50 (23;83) |
46 (13;71) |
4 (1;11) |
56 (17;77) |
12 (0; 45) |
32 (22;44) |
2116.00 | 1448 | -- | −781.00 |
| AE | 70 (58;78) |
-- | 31 (22;43) |
97 (91;99) |
-- | 3 (1;9) |
2123.00 | 1451 | 7.30 (.06) |
−780.00 |
| CE | -- | 83 (74;90) |
17 (10;26) |
-- | 56 (45;65) |
44 (35;55) |
2136.00 | 1451 | 20.23 (<.001) |
−766.02 |
| ACE- no a21 |
47 (20;77) |
50 (20;73) |
4 (2;12) |
53 (14;68) |
15 (3;47) |
32 (23;45) |
2217.00 | 1449 | 1.23 (.30) |
−781.20 |
| ACE-no no a22 |
44 (14;80) |
51 (17;76) |
5 (1;14) |
34 (0;72) |
30 (0;60) |
37 (26;50) |
2120.30 | 1449 | 5.00 (<.05) |
−778.00 |
| ACE-no c21 |
55 (27;86) |
42 (10;66) |
4 (1;11) |
61 (22;78) |
7 (0;40) |
32 (22;44) |
2116.43 | 1449 | .83 (.40) |
−781.60 |
|
ACE- no c22 |
50 (23;84) |
46 (13;71) |
4 (1;11) |
65 (36;77) |
4 (0;30) |
31 (22;42) |
2116.00 | 1449 |
.23 (.60) |
−782.20 |
| Frequency of Alcohol Intoxication | ||||||||||
| Drive for Thinness | ||||||||||
| ACE | 47 (17;81) |
35 (3;61) |
18 (11;27) |
57 (17;78) |
12 (0;45) |
32 (22;42) |
2770.00 | 1577 | -- | −385.40 |
| AE |
84 (77;88) |
-- |
16 (11;24) |
70 (58;78) |
-- |
31 (22;42) |
2774.10 | 1580 |
5.50 (.14) |
−386.00 |
| CE | -- | 72 (63;80) |
28 (26;37) |
-- | 56 (45;65) |
44 (35;55) |
2787.00 | 1580 | 18.10 (<.001) |
−373.32 |
| AE-no a21 | 81 (72;88) |
-- | 19 (12;28) |
66 (54;76) |
-- | 34 (24;46) |
2792.23 | 1581 | 18.15 (<.001) |
−370.00 |
| AE-no a22 | 78 (64;87) |
-- | 22 (13;36) |
24 (9;41) |
-- | 76 (59;91) |
2844.32 | 1581 | 70.23 (<.001) |
−317.70 |
| Body Dissatisfaction | ||||||||||
| ACE | 47 (18;81) |
35 (3;61) |
18 (12;26) |
84 (66;90) |
1 (0;37) |
15 (10;22) |
2950.00 | 1578 | -- | −206.20 |
| AE |
84 (16;90) |
-- |
16 (11;24) |
85 (78;90) |
-- |
15 (10;22) |
2954.60 | 1581 |
5.00 (.20) |
−207.42 |
| CE | -- | 73 (64;80) |
27 (20;36) |
-- | 70 (62;77) |
30 (23;38) |
1581 | 40.00 (<.001) |
−175.21 | |
| AE-no a21 | 82 (74;88) |
-- | 18 (12;26) |
68 (57;78) |
-- | 32 (22;43) |
2871.80 | 1582 | 15.30 (<.001) |
−192.00 |
| AE-no a22 | 74 (60;84) |
-- | 26 (16;40) |
26 (12;42) |
-- | 74 (58;90) |
2930.00 | 1582 | 70.34 (<.001) |
−119.30 |
Note. Final best fit model shown in bold. 95% confidence interval for parameter estimates in parentheses. a2 = heritability. c2 = common environmental estimate. e2 = individual-specific environmental estimate. −2lnL = difference in twice the negative log-likelihood of the models. Df = degrees of freedom. χ2 diff (p) = chi-square difference between full model and submodel and the associated p-value. AIC = Akaike Information Criterion. a21 = genetic covariance path from Figure 1. a22 = residual genetic effect path for unique genetic effects on eating disorder symptom from Figure 1. c21 = common environment covariance path from Figure 1. c22 = residual common environment effect path for unique common environmental effects on eating disorder symptom from Figure 1.