Variable results and conclusions are attributable to variable test conditions such as the dispersibility of CNTs in solution and the amount of CNTs used, as well as the amount of CNTs impurities, but not the form of CNTs (all studies assessed particulate substances).
As a result, the observed subgroup effect may be attributable to other variables than the subgrouping variable [ 12].
The wide range of test readouts at the baseline visit might be attributable to the variable interval from onset of symptoms to testing.
However, even in this study the difference in sperm sizes is thought to be attributable to more variable sperm length within consort males and due to a few consort individuals having unusually short sperm [ 19].
Presence of a variety of rPrPSc including PrPSc type 1 and type 2 in sCJD and PrP7-8 in GSS detected by Western blotting and distinct brain PrP deposits detected by immunohistochemistry might be attributable to the variable PrPSc conformation [ 11, 12].
For the whole sample, poor reading achievement, marked distractibility, and lower intelligence were associated with seropositivity, but by using multiple regression analysis, we found that these associations may be attributable to confounding variables.
Sections from WT and KO mice were always immunostained in parallel within the same experiment to ensure that any apparent differences cannot be attributable to procedural variables, such as small differences in chemical reaction time.
The low importance of fire in our models is therefore puzzling, and may be attributable to the particular variable that was used in the model to indicate fire (see discussion in the section on "Predictor selection" above).
If indeed collaborative communication stimulates adherence behaviours, its positive influence may be attributable to an intervening variable i.e. enhancing patient beliefs about the medication prescribed [ 17].
Thus, the effects of time since RAA could very well be attributable to this clinical variable, but statistically could not be assigned to either of them due to collinearity.
