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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Psychosom Med. 2015 Jun;77(5):559–566. doi: 10.1097/PSY.0000000000000182

Table 4.

Comparison of the fit of competing twin models of the nature of the MD-T2DM relationship: Age 40 – 55

Model description Log-likelihood AIC Degrees of
freedom
difference vs.
Bivariate ACE		 P value
Full Bivariate ACE (Non-causal: MD-T2DM due to shared genetic and/or environmental factors) 4626.04 −10135.96 -- --
Bidirectional causation (MD ↔ T2DM) 4623.16 −10140.85 1 0.99
Unidirectional causation (MD→ T2DM) 4626.49 −10139.51 2 0.80
Unidirectional causation (T2DM→ MD) 4630.00 −10136.00 2 0.14
No correlation between MD and T2DM 4636.43 −10131.57 3 0.024

P-value from −2Log-likelihood test of relative model fit. Limited to twins aged 40 – 55.