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Letters Dutch perinatal mortality

Authors’ reply

BMJ 2010; 341 doi: (Published 07 December 2010) Cite this as: BMJ 2010;341:c7023
  1. Annemieke C C Evers, PhD student, resident in gynaecology1,
  2. Hens A A Brouwers, neonatologist1,
  3. Chantal W P M Hukkelhoven, epidemiologist2,
  4. Peter G J Nikkels, pathologist1,
  5. Janine Boon, gynaecologist3,
  6. Anneke van Egmond-Linden, gynaecologist4,
  7. Jacqueline Hillegersberg, paediatrician5,
  8. Yvette S Snuif, gynaecologist6,
  9. Sietske Sterken-Hooisma, midwife secondary care7,
  10. Hein W Bruinse, professor of obstetrics1,
  11. Anneke Kwee, gynaecologist1
  1. 1University Medical Center Utrecht, 3584 EA Utrecht, Netherlands
  2. 2Netherlands Perinatal Registry, Utrecht, Netherlands
  3. 3Department of Obstetrics and Gynaecology, Diakonessenhospital, Utrecht, Netherlands
  4. 4Department of Obstetrics and Gynaecology, Zuwe Hofpoort Hospital, Woerden, Netherlands
  5. 5Department of Pediatrics, St Antonius Hospital, Nieuwegein, Netherlands
  6. 6Department of Obstetrics and Gynaecology, Admiraal de Ruyter Hospital, Goes, Netherlands,
  7. 7Department of Obstetrics and Gynaecology, Meander Medical Center, Amersfoort, Netherlands
  1. a.evers{at}

De Jonge and colleagues and Pop and Wijnen commented on the nomenclature of our study.1 2 We performed a cohort study, including cases in a prospective manner. Thus important problems associated with retrospective data collection—such as dependence of the investigator on the availability and accuracy of medical case records and classification bias of the cases—are prevented. The population at risk was estimated retrospectively …

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