Letters Genetics and postpartum haemorrhage

Authors’ reply to Sholapurkar

BMJ 2014; 349 doi: https://doi.org/10.1136/bmj.g6210 (Published 14 October 2014) Cite this as: BMJ 2014;349:g6210
  1. Anna Sara Oberg, research fellow12,
  2. Brian T Bateman, anesthesiologist and assistant professor 34
  1. 1Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA
  2. 2Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, PO Box 281, Stockholm, Sweden
  3. 3Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
  4. 4Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, USA
  1. oberg{at}hsph.harvard.edu

We appreciate Sholapurkar’s interest in our study and welcome the opportunity to clarify our methods and the implications of our findings.1 2

Because we studied the extent of clustering of postpartum haemorrhage (PPH) in differentially related births (within family cluster correlation), there is no traditional “control group.” Irrespective of outcome, all births (affected and unaffected) that belong to a certain type …

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