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Clarifying the interrupted time series study design
  1. Theodore Svoronos1,
  2. Atle Fretheim2,3
  1. 1Harvard University, Boston, Massachusetts, USA
  2. 2Global Health Unit, Norwegian Knowledge Centre for the Health Services, Oslo, Norway
  3. 3Institute of Health and Society, University of Oslo, Oslo, Norway
  1. Correspondence to Theodore Svoronos, Harvard University, Boston, MA 02138, USA; tsvoronos{at}

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We believe that the use of the term ‘interrupted time series study’ to describe two reports from this year’s February issue of BMJ Quality & Safety is potentially misleading.1 ,2 Putting aside the merits of the studies themselves, we would like to clarify what the interrupted time series design entails to promote a productive conversation of its particular strengths and shortcomings.

The interrupted time series …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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