Objective and methods: It is rare that trialists report power estimations of non-primary outcomes. In the present article, we will describe how to define a valid hierarchy of outcomes in a randomised clinical trial, to limit problems with Type I and Type II errors, using considerations on the clinical relevance of the outcomes and power estimations. Conclusion: Power estimations of non-primary outcomes may guide trialists in classifying non-primary outcomes as secondary or exploratory. The power estimations are simple and if they are used systematically, more appropriate outcome hierarchies can be defined, and trial results will become more interpretable.
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Giannattasio, Antonietta
Di Costanzo, Pasquale
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Di Costanzo, Pasquale
De Matteis, Arianna
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
De Matteis, Arianna
Milite, Paola
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Milite, Paola
De Martino, Daniela
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
De Martino, Daniela
Bucci, Laura
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Bucci, Laura
Augurio, Maria Rosaria
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Augurio, Maria Rosaria
Bravaccio, Carmela
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Bravaccio, Carmela
Ferrara, Teresa
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Ferrara, Teresa
Capasso, Letizia
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy
Capasso, Letizia
Raimondi, Francesco
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Univ Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, ItalyUniv Federico II, Div Neonatol, Dept Translat Med Sci, Via Pansini 5, I-80131 Naples, Italy