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OtherResearch

Statistically significant versus practically relevant trend in stability data

Bernhard Schmelzer, André Mischo and Franz Innerbichler
PDA Journal of Pharmaceutical Science and Technology February 2021, pdajpst.2020.012336; DOI: https://doi.org/10.5731/pdajpst.2020.012336
Bernhard Schmelzer
Novartis AG
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  • For correspondence: bernhard.schmelzer@novartis.com
André Mischo
Novartis AG
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  • For correspondence: andre.mischo@novartis.com
Franz Innerbichler
Novartis AG
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  • For correspondence: franz.innerbichler@novartis.com
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Abstract

How to decide whether a statistically significant trend is of practical relevance? In the context of stability data of pharmaceuticals, this publication provides a way forward to use different measures of (method) variability to compare to the observed changes over time. A panel of analytical experts assessed whether statistical significant trends were of practical relevance or not. For different types of assessing variability, recommendations for decision criteria were derived that best match these assessments i.e. finding a suited balance between not detecting a relevant trend and between flagging a trend wrongly as relevant. For this purpose, more than 60 data sets from Biosimilar projects of Sandoz/Novartis were leveraged. Hence, this paper provides a scientific way for an assessment whether a statistically significant trend is of practical relevance or not and a case study is presented and discussed.

  • Stability
  • TOST
  • equivalence test
  • relevant change over time
  • significant change over time
  • Received September 3, 2020.
  • Accepted February 8, 2021.
  • Copyright © 2021, Parenteral Drug Association

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PDA Journal of Pharmaceutical Science and Technology: 79 (1)
PDA Journal of Pharmaceutical Science and Technology
Vol. 79, Issue 1
January/February 2025
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Statistically significant versus practically relevant trend in stability data
Bernhard Schmelzer, André Mischo, Franz Innerbichler
PDA Journal of Pharmaceutical Science and Technology Feb 2021, pdajpst.2020.012336; DOI: 10.5731/pdajpst.2020.012336

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Statistically significant versus practically relevant trend in stability data
Bernhard Schmelzer, André Mischo, Franz Innerbichler
PDA Journal of Pharmaceutical Science and Technology Feb 2021, pdajpst.2020.012336; DOI: 10.5731/pdajpst.2020.012336
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Keywords

  • stability
  • TOST
  • equivalence test
  • relevant change over time
  • significant change over time

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