The most probable reason for a lower r 2 could be attributed to an unaccounted variable such as time, an important parameter that evaluates the production of Al3+ ions from the electrodes, driving the efficiency of decolorization within the system (Daneshvar et al. 2006a).
Initial inspection of the results from the linear mixed effect model revealed conservative P-value distribution for some factors, implying the existence of unaccounted confounding variables.
Specifically, the effects of unaccounted confounding variables in the context of RCTs (e.g. effect of co-interventions in one arm versus other) have not been systematically evaluated.
Finally, our patients were not part of a randomized study and treatment data were not systematically analyzed; as such, differences in treatments and other unaccounted-for variables could limit our univariate and multivariate models.
Lack of adequately powered randomized controlled study (RCT) and variables unaccounted for such fluid balance changes or clustering effect are, however, to be taken into account when interpreting these negative results.
It is also possible that the difference was due to other confounding variables unaccounted for in this study.
With the extensive polymorphism penetration in Toll-like receptors, a poor antibody response to influenza vaccination presents another confounding variable unaccounted for by simply relying on chronologic age.
Obviously, there were a lot of variables that were unaccounted for in this "research," but it did show that kids may define the notion of "treat" much more broadly than many of us do.
Physical activity appears to play a greater role as a determinant of subjective well-being than do biomarkers of somatic health, especially in females, but most of the variance remained unaccounted for by the studied variables.
