Table 1.
Age, gender and MMSE (mini-mental state examination) of twin participants.
Fig 1.
Path diagram representing the structural equation model used to calculate A (additive genetics) and E (unique environmental) factors.
Table 2.
Volumetric analyses.
Fig 2.
Plot of total brain volume and age.
Table 3.
Twin intra-pair analyses.
Fig 3.
Twin-twin correlation plot of total brain volume.
Table 4.
Structural equation modelling results.