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Referral bias was present, because the patients in our population were referred by their treating physicians to undergo invasive coronary imaging on the basis of their chest pain presentation with or without outcome of stress testing.
Patients referred by their treating physician for ICA between July 2004 and June 2009 on the basis of chest pain presentation (typical, atypical and non-anginal complaints) with or without outcome of stress testing were invited to undergo CTCA within 2 weeks of ICA.
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We compared groups with and without the outcome of interest.
It's the logic of collectivism without the outcome of greater equality and justice.
Observations were censored at death or day 100 if the patient survived without the outcome of interest.
This descriptive information is preferably presented separately for those people with and without the outcome of interest.
Preferably the report should present separate distributions for participants with and those without the outcome of interest, as this illustrates the discriminative accuracy of the risk model.
NRI measures the ability of a new model to correctly reclassify patients without the outcome of interest (i.e. death) into lower risk categories and patients with the outcome of interest into higher risk categories.
Model performance is assessed by its ability to distinguish between those with and without the outcome of interest (discrimination) and by looking at the agreement between the frequency/proportion of observed and predicted outcomes (calibration).
Pepe et al. proposed five phases for identifying and validating predictive biomarkers [ 53], in which phases 1 and 2 consist of retrospective analysis to determine the biomarker's capacity to distinguish between individuals with and without the outcome of interest.
We expect that the measurement error will be nondifferential, which usually biases effect estimates toward the null because they tend to obscure contrasts between the exposed and unexposed and those with or without the outcome of interest.
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CEO of Professional Science Editing for Scientists @ prosciediting.com