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Correspondence
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Volume 346:1831-1832 June 6, 2002 Number 23
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The Interval between Pregnancies and Preeclampsia

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by Skjærven, R.
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To the Editor: Skjærven et al. (Jan. 3 issue)1 analyzed data from the Medical Birth Registry of Norway and concluded that an extended interval between births is a previously unrecognized risk factor for preeclampsia. After adjustment for the interval between births, a change in partner was no longer a risk factor for preeclampsia. The authors did not consider two potential sources of error that may have biased their findings. The first is confounding by unregistered induced abortions, because only outcomes of pregnancies at least 16 weeks in duration were included in the birth registry. Induced abortions protect against preeclampsia2,3 and . . . [Full Text of this Article]

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