Study sample is biased
22 August 2012
Authors have taken a biased study sample already. A Post-dated (prolonged) pregnancy may also end-up in still-birth. Authors have excluded stillbirths both from first and recurred pregnancies. All we need is to measure the gestational age (post-dated are 42 weeks and above). If still births have a reported and more precisely documented gestational age then they can be included in the study.
Competing interests: None declared
Indian Council of Medical Research, Ansari Nagar, New Delhi-110029
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