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Table 5 Comparative fits of models to explain the relationships between IBS and self-rated health measures

From: The relationships between IBS and perceptions of physical and mental health—a Norwegian twin study

  ep − 2LL df AIC χ2 Δdf p
IBS predicts
SRH physical
 Saturated 17 3589.51 3741 − 3892.49
 Causal 11 3595.77 3747 3898.23 6.26 6 0.40
 Genetic 13 3599.89 3745 − 3890.11 10.38 4 0.04
 Shared environmental 11 3610.43 3747 − 3883.57 20.92 6 0.00
SRH mental
 Saturated 17 1935.29 3628 − 5320.71
 Causal 11 1944.93 3634 − 5323.07 9.64 6 0.14
 Genetic 13 1938.01 3632 5325.99 2.72 4 0.61
 Shared environmental 11 1947.56 3634 − 5320.45 12.26 6 0.06
Physical health hinders activities
 Saturated 17 3017.39 3626 − 4234.61
 Causal 11 3020.16 3632 4243.85 2.76 6 0.84
 Genetic 13 3020.88 3630 − 4239.12 3.48 4 0.48
 Shared environmental 11 3024.38 3632 − 4239.63 6.98 6 0.32
Mental health hinders activities
 Saturated 17 1737.35 3539 − 5340.65
 Causal 11 1743.52 3545 5346.48 6.17 6 0.41
 Genetic 13 1747.07 3543 − 5338.93 9.72 4 0.05
 Shared environmental 11 1750.73 3545 − 5339.27 13.38 6 0.04
  1. ep estimated parameters; − 2LL minus to log-likelihood; df degrees of freedom; AIC Akaike’s Information Criterion; χ2 difference in the log-likelihood to the base model; Δdf difference of the degrees of freedom with the base model; p p-value. In bold—the lowest AIC corresponding to the best fitting model for each of the relationship