2021-08-07 06:40
(40 d 14:00 ago)

Posting: # 22516
Views: 662

 Outlier for different regulatories [Outliers]

Hi I need clarity on outlier test inclusion in study Protocols.

Can we include outlier test in US, EMA protocols for 2 way crossover and replicate design studies.

please help me out.
Vienna, Austria,
2021-08-07 11:27
(40 d 09:12 ago)

@ gsrao2022
Posting: # 22517
Views: 539

 Outlier for different regulatories

Hi gsrao,

» Can we include outlier test …

You are free to do anything. Acceptance is another cup of tea.

» … in US, EMA protocols for 2 way crossover and replicate design studies.

  • US: Generally no. However, similar to the EMA’s conditions for ABE.

  • EMA: for ABE (any crossover and replicate designs)
    In principle any reason for exclusion is valid provided it is specified in the protocol and the decision to exclude is made before bioanalysis.
    Examples of reasons to exclude the results from a subject in a particular period are events such as vomiting and diarrhoea which could render the plasma concentration-time profile unreliable. In exceptional cases, the use of concomitant medication could be a reason for excluding a subject.
    Exclusion of data cannot be accepted on the basis of statistical analysis
    […] alone, because it is impossible to distinguish the formulation effects from other effects influencing the pharmacokinetics.
    The exceptions to this are:
    1. A subject with lack of any measurable concentrations or only very low plasma concentrations for reference medicinal product. A subject is considered to have very low plasma concentrations if its AUC is less than 5% of reference medicinal product geometric mean AUC (which should be calculated without inclusion of data from the outlying subject). The exclusion of data due to this reason will only be accepted in exceptional cases and may question the validity of the trial.
    2. Subjects with non-zero baseline concentrations > 5% of Cmax. Such data should be excluded from bioequivalence calculation.
    EMA: for ABEL only
    As for ABE. Additionally:
    The applicant should justify that the calculated intra-subject variability is a reliable estimate and that it is not the result of outliers.

    A statistical test is not acceptable. Box plots of studentized model residuals (in the estimation of \(\small{CV_\textrm{wR}}\), not the T vs R comparison) are preferred. Seemingly a [image] fence of 2 is acceptable. If outliers are detected, \(\small{CV_\textrm{wR}}\) has to be recalculated after exclusion – which will lead to less expansion! However, the 90% CI has to be calculated from the entire data. On a case-by-case basis a study might (‼) be accepted, if both analyses pass ABEL. Personal comment: So what?
    For details see the vignette of the [image] package replicateBE and the Q&A-document of the EGA/EMA (London, June 2010).

Dif-tor heh smusma 🖖
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes
 Admin contact
21,678 posts in 4,533 threads, 1,541 registered users;
online 7 (0 registered, 7 guests [including 1 identified bots]).
Forum time: Thursday 20:40 CEST (Europe/Vienna)

Ignorance more frequently begets confidence
than does knowledge.    Charles Darwin

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz