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. Author manuscript; available in PMC: 2013 Nov 1.
Published in final edited form as: J Adolesc Health. 2012 Apr 10;51(5):491–496. doi: 10.1016/j.jadohealth.2012.02.013

Table 3.

Correlated Factor Model Fit Statistics for Age at Menarche and Eating Disorder Risk Composite.

Model
No.		 Parameters Estimated −2lnL Df χ2 diff (df) AIC
I AmCmEm, AdCdEd, ra rc re:
All genetic and environmental estimates for age
at menarche and disordered eating; all genetic and
environmental correlations		 3874.11 1387 -- 1100.11
II AmCmEm, AdCdEd, rc re:
All genetic and environmental estimates for age
at menarche and disordered eating; shared and
unique environmental correlations		 3877.46 3.35 (1) 1101.46
III AmCmEm, AdCdEd, ra re:
All genetic and environmental estimates for age
at menarche and disordered eating; genetic and
unique environmental correlations		 3874.30 1388 0.19 (1) 1098.30
IV AmCmEm, AdEd, ra re:
All genetic and environmental estimates for age
at menarche; genetic and unique environmental
estimates for disordered eating; genetic and
unique environmental correlations		 3876.82 1389 2.72 (2) 1098.82
V AmEm, AdEd, ra re:
Genetic and unique environmental estimates for
age at menarche and disordered eating; genetic
and unique environmental correlations		 3876.82 1390 2.72 (3) 1096.82
VI AmEm, AdEd, re:
Genetic and unique environmental estimates for
age at menarche and disordered eating; unique
environmental correlation		 3885.50 1391 11.39 (4)* 1103.50
VII AmEm, AdEd, ra:
Genetic and unique environmental estimates
for age at menarche and disordered eating;
genetic correlation 		3876.87 1391 2.76 (4) 1094.87
VIII CmEm, CdEd, rc rc:
Shared and unique environmental estimates for
age at menarche and disordered eating; shared
and unique environmental correlations		 3925.14 1390 51.02 (3)* 1145.14
IX Em, Ed, re:
Unique environmental estimates for age at
menarche and disordered eating; unique
environmental correlation		 4182.16 1393 308.10 (6)* 1396.16

Best-fit model shown in bold. −2lnL = twice the negative log-likelihood. Df = degrees of freedom. χ2 diff = Chi-square difference from full model. AIC = Akaike information criterion. Those estimates with the subscript m refer to age at menarche. Those estimates with the subscript d refer to disordered eating. A = additive genetic. C = shared environment. E = unique environment. ra = genetic correlation. rc = shared environmental correlation. re = unique environmental correlation.

*

p < .05