Interfering variables will also play a role.
13 In this study, the incontinence episodes were reduced after doing pelvic floor exercises, even if the potential interfering variables were not taken into account.
To examine whether this effect might be due to other interfering variables, such as sedation or mode of mechanical ventilation, we also performed simple regression analysis for these variables.
Another limitation is lack of quantitative analysis of peripheral arterial vasculature such as arterial vessel size, sheath-femoral artery ratio (SFAR), calcification, and tortuosity, which could be potential interfering variables.
Mainly, we must consider that our study population, which included all patients admitted for acute coronary syndrome in the coronary care unit within 15 months, was subjected to strict inclusion/exclusion criteria to eliminate possible interfering variables, thus limiting the extrapolation of our results to the real world of acute myocardial infarction patients.
Here again, the exclusion of interfering third variables is a methodological challenge.
Selective participation may have biased the results towards increased morbidity interfering with variables of interest like personality traits, coping behaviour and seeking treatment.
To investigate, in the absence of interfering disease variables, the physiological role of the brain EPO system regarding cognition, we performed a series of studies in healthy young mice where we found hippocampal memory, measured by classical fear conditioning, improved after 3 weeks of EPO treatment.
Exclusion criteria for this group were among others diseases such as cancer, autoimmune disease, or any other disorders likely to interfere with variables under investigation.
Field detection and identification of a range of volatile chemicals, including explosives, is particularly challenging when they are present at low levels and/or in the presence of variable interfering backgrounds.
