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Epidemiology of pregnancies with unknown last menstrual period.
  1. P Buekens,
  2. P Delvoye,
  3. E Wollast,
  4. C Robyn


    A group of women with unknown last menstrual period was studied representing 16% of a total of 22 404 pregnant women recorded using a common perinatal form. Unknown menstrual period is associated with high rates of low birth weight and with low socioeconomic and sociodemographic status. Such characteristics are also associated with a high rate of preterm deliveries. Thus any possible bias introduced in studies of prematurity by ignoring the group of women with unknown last menstrual period should be carefully checked.

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