Table 4 Model-fitting analysis of retinal arterial tortuosity adjusted for age and gender in 57 monozygotic and 52 dizygotic twin pairs
ModelGenetic componentEnvironmental componentsFit statistics
A*CEAICp Valueχ2
1. ACE saturated model0.81 (0.18 to 0.92)0.000.19 (0.08 to 0.38)
2. ACE0.76 (0.16 to 0.92)0.04 (0.00 to 0.57)0.18 (0.08 to 0.37)1.040.083.0
3. ACE0.78 (0.16 to 0.92)0.04 (0.00 to 0.57)0.18 (0.08 to 0.37)−0.940.223.0
4. AE†0.82 (0.64 to 0.92)0.000.18 (0.08 to 0.36)−2.930.383.1
5. CE0.65 (0.47 to 0.78)0.35 (0.22 to 0.53)3.250.039.2
  • *Data are the proportion of total variation attributable to the model component (95% confidence interval). Model components are additive genetic factors (A), common environment (C) to unshared environment (E).

  • †Bold text indicates the best-fitting model, based on Akaike’s Information Criterion (AIC).