Table 7.
Multivariate logistic Regression Predicting Unresolved Attachment Classification
| Source of variation | B | Wald | df | P | OR | 95% CI |
|---|---|---|---|---|---|---|
| Model 1: Control variables | ||||||
| Current age | 0.07 | 2.43 | 1 | .12 | 1.07 | 0.98, 1.16 |
| Sex | −1.17 | 3.48 | 1 | .06 | 0.31 | 0.09. 1.06 |
| Biological parent diagnosis | −0.85 | 1.93 | 1 | .16 | 0.43 | 0.13, 1.42 |
| Age adopted | 1.77 | 3 | .62 | |||
| 1 to 3 months | 1.03 | 1.73 | 1 | .19 | 2.81 | 0.60, 13.10 |
| 3 to 6 months | 0.49 | 0.23 | 1 | .63 | 1.63 | 0.22, 11.98 |
| Greater than 6 months | −21.03 | 0.00 | 1 | 1.00 | 0.00 | 0.00 |
| Depression | 0.04 | 0.83 | 1 | .36 | 1.04 | 0.96, 1.12 |
| Interpersonal sensitivity | 0.04 | 0.85 | 1 | .36 | 1.04 | 0.96, 1.12 |
| Model 2: 5-HTTLPR genotype | ||||||
| Sex | −1.21 | 4.57 | 1 | .03 | 0–30 | 0.10,0.91 |
| Trauma reported | 1.17 | 2.78 | 1 | .10 | 3–21 | 0.82, 12.61 |
| 5-HTTLPR contrastsa | 8.79 | 2 | .01 | |||
| s/s genotype | 1.85 | 6.05 | 1 | .02 | 6.34 | 1.46, 27.64 |
| s/l genotype | 2.01 | 8.15 | 1 | <.01 | 7.43. | 1.88,29.41 |
| Model 3: 5-HTTLPR dominance effect | ||||||
| Sex | −1.21 | 4.64 | 1 | .03 | 0.30 | 0.10,0.90 |
| Trauma reported | −1.16 | 2.77 | 1 | .10 | 0.31 | 0.08, 1.23 |
| 5-HTTLPR dominanceb | 1.94 | 8.73 | 1 | <.01 | 6.97 | 1.92,25.24 |
Note. N = 86. Biological parent diagnosis includes alcohol problems and/or antisocial behaviors. OR = odds ratio; CI = confidence interval.
a
The contrast option available in the logistic regression command was used, The l/l 5-HTTLPR genotype was designated as the reference group.
b
Dummy coding was used to construct the dominatice contrast: s/s or s/l = 1 and l/l = 0.