That is, the variance of a behavior being investigated is decomposed into three orthogonal components: additive genetic effects (A), common environment effects (C), and unique environment effects (E), hence the acronym ACE models.5.5
Socio-demographic and medical correlates significantly explained 20% of the variance of PA behavior while social-cognitive correlates as attitude explained an additional 4% and intention together with actual control explained another 1% of the variance of PA behavior.
The integrative model of behavioral prediction (IMBP), proposes that a limited number of variables can be identified to explain a substantial portion of the variance of a behavior.
Furthermore, intention and actual control explained 1% of the variance of PA behavior in the third step, when controlling for the preceding factors.
There was a fair fit of the model to the data (χ = 110.6, df = 38, p = 0.00, ratio 2.9, NFI = 0.74, and RMSEA of 0.09), it explained 8% of the variance of exercise behavior at six months post hip fracture.
While this model showed a good fit to the data (χ = 22.6, df =14, p = 0.07, ratio 1.6; NFI = 0.84, and RMSEA of 0.05), it explained only 10% of the variance of exercise behavior at two months post hip fracture.
In step one of the linear regression analysis, background factors significantly explained 20% of the variance of PA behavior (F(10, 2457) = 61.86, p < .000, R = .45, R = .20).20
When controlling for background factors, social-cognitive factors additionally explained 4% of the variance of PA behavior (F(13, 2397) = 57.48, p < .000, R = .49, R = .24, ΔR = .04).04
There was a fair fit of the model to the data (χ = 59.7, df = 19, p = 0.00, ratio 3.1, NFI = 0.76, and RMSEA of 0.10), and the model explained 21% of the variance of exercise behavior at twelve months post hip fracture.
We collected three replicate samples from each colony, grouped the samples in blocks of three, assigned one of the three isotopic labels to each sample, and assigned colonies to blocks in order to minimize the variance of the hygienic behavior variables.
