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

BMC Gastroenterology

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

	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

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

ISSN: 1471-230X