Physical activity as a mediator of the impact of chronic conditions on quality of life in older adults-2

<p><b>Copyright information:</b></p><p>Taken from "Physical activity as a mediator of the impact of chronic conditions on quality of life in older adults"</p><p>http://www.hqlo.com/content/5/1/68</p><p>Health and Quality of Life Outcomes 2007;5():68-68.</p><p>Published online 19 Dec 2007</p><p>PMCID:PMC2246116.</p><p></p

Physical activity as a mediator of the impact of chronic conditions on quality of life in older adults-0

<p><b>Copyright information:</b></p><p>Taken from "Physical activity as a mediator of the impact of chronic conditions on quality of life in older adults"</p><p>http://www.hqlo.com/content/5/1/68</p><p>Health and Quality of Life Outcomes 2007;5():68-68.</p><p>Published online 19 Dec 2007</p><p>PMCID:PMC2246116.</p><p></p

Explained within-class item-variances of the LVMM.

<p>Explained within-class item-variances of the LVMM.</p

Description of the Sample and Latent Classes.

<p>Description of the Sample and Latent Classes.</p

Cumulative Frequency Distributions of Difference Scores of Theta.

<p>Cumulative Frequency Distributions of Difference Scores of Theta.</p

Flowchart of simulation analyses.

<p>Flowchart of simulation analyses.</p

IRT Mixture Analyses of the Pain Item Bank.

<p>IRT Mixture Analyses of the Pain Item Bank.</p

Regression coefficient estimates for the effects of demographic and health status variables on physical functioning and mental health latent variables in models without differential item functioning (no-DIF) and with differential item functioning (DIF) in the Canadian Multicentre Osteoporosis Study.

<p>Regression coefficient estimates for the effects of demographic and health status variables on physical functioning and mental health latent variables in models without differential item functioning (no-DIF) and with differential item functioning (DIF) in the Canadian Multicentre Osteoporosis Study.</p

Illustration of the multiple indicators multiple causes model to test for differential item functioning on SF-36 sub-scale items.

<p>In this model, <i>y</i>_<i>i</i> is the <i>i</i>th sub-scale item (<i>i</i> = 1, …, <i>I</i>); the dashed arrow from each covariate to the item represents the DIF (i.e., direct) effect; <i>β</i>_<i>1Sex</i> is the regression coefficient for the difference in thresholds on item <i>i</i> for males and females; similar regression coefficients are defined for other model covariates; <i>α</i>_<i>i</i> is the regression coefficient for the latent variable and the <i>i</i>th item; <i>γ</i>_<i>k</i> is the regression coefficient for the latent variable and the <i>k</i>th covariate (<i>k</i> = 1, …, <i>K</i>); <i>τ</i>_<i>ij</i> is the threshold for the (<i>j</i>– 1) th response category <i>(j</i> = 1, <i>…</i>,<i>J</i>) for item <i>i</i>; <i>ε</i>_<i>i</i> is the error term for the <i>i</i>th item; <i>ζ</i> is the residual error for the latent variable.</p

Tests for differential item functioning on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.

<p>Tests for differential item functioning on the SF-36 physical functioning and mental health sub-scale items in the Canadian Multicentre Osteoporosis Study.</p