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This was done since the variability of correlation coefficients hindered efforts to define a single universally applicable cutoff level.
Therefore, there are no fixed and universally applicable cutoff points to separate insufficient from sufficient adrenal responses in the critically ill, depending on severity of disease.
There are no universally applicable cutoff values for cortisol levels – and increases in cortisol levels with increasing levels of ACTH – for the diagnosis of relative adrenal insufficiency (or as it is now commonly termed, critical illnes-related corticosteroid insufficiency) following, for example, subarachnoid hemorrhage or other intracranial catastrophes.
While this and a previous study [ 14] used a value of ≤ 50% reduction of AB (which, as demonstrated, corresponds to a many log-fold reduction in CFU), much more data from a variety of labs will be necessary to define the most broadly applicable cutoff.
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Subgroups defined by clinically applicable cutoffs will also be compared (e.g., BMI as normal weight, overweight, or obese; 25OHD concentration by Institute of Medicine cutoffs).
Although semiquantitative methods, such as determination of the maximum standard uptake value (SUVmax), partially meet these criteria, studies have not defined a uniformly applicable SUVmax reduction cutoff that accurately predicts PFS or clinical outcome.
Another critically important consideration for protein biomarker assays is for the assay developer to define the algorithm and clinical cutoff, if applicable.
For each PD measure, quartiles were defined based on the distribution of that density measure among the control subjects for all applicable analyses (explicit quartile cutoff values and ranges are provided in the results below).
In addition, genotyping peripheral blood cells, which we did in the present study, is more optimal than evaluating tumour expression levels of mRNA or protein, in which there may not be clinical accessibility or the assay may not be applicable because of arbitrary cutoff levels, lack of standard criteria, or observer variation.
The cutoff ratio is applicable, for example, in a patient with one positive lymph node among 20 examined, which results in a LND ratio of 0.05.
Additional NSCLC samples (N = 300) demonstrated a similar unimodal distribution to that observed in this study, suggesting that the defined cutoff may be applicable to future NSCLC studies.
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