Table 4.
Results of twin model fitting for left eye only.
| Model | Minus2LL | df | p | AIC | |
|---|---|---|---|---|---|
| Resting state 1 | ACE | 639.98 | 310 | 0.96 | 19.98 |
| pupil diameter | ADE | 640.02 | 310 | 0.96 | 20.02 |
| (complete twin pairs = 157) | AE | 640.02 | 311 | 0.98 | 18.02 |
| CE | 672.15 | 311 | <0.01 | 50.15 | |
| E | 747.73 | 312 | <0.01 | 123.73 | |
| Amplitude | ACE | −16.64 | 286 | 0.22 | −588.64 |
| (complete twin pairs = 145) | ADE | −17.84 | 286 | 0.31 | −589.84 |
| AE | −16.64 | 287 | 0.31 | −590.64 | |
| CE | −1.72 | 287 | <0.01 | −575.72 | |
| E | 29.41 | 288 | <0.01 | −546.59 | |
| Constriction velocity | ACE | 608.92 | 286 | 0.17 | 36.92 |
| (complete twin pairs = 145) | ADE | 607.36 | 286 | 0.27 | 35.36 |
| AE | 608.92 | 287 | 0.24 | 34.92 | |
| CE | 621.44 | 287 | <0.01 | 47.44 | |
| E | 647.51 | 288 | <0.01 | 71.51 | |
| Pupil latency | ACE | 2,723.68 | 286 | 0.24 | 2,155.68 |
| (complete twin pairs = 145) | ADE | 2,722.27 | 286 | 0.36 | 2,150.27 |
| AE | 2,723.68 | 287 | 0.33 | 2,149.68 | |
| CE | 3,300.08 | 287 | <0.01 | 2,612.08 | |
| E | 2,739.84 | 288 | <0.01 | 2,163.84 |
The Akaike information criterion (AIC) is used to evaluate the most parsimonious model, which is highlighted in bold. For each model the minus 2 log-likelihood (minus2LL), and degrees of freedom (df) for model comparison are given. A, additive genetic effects; D, dominant genetic effects; C, common environmental effects; E, unique environmental effects (and measurement error).