Int J Epidemiol. 1999 Apr;28(2):253-7.
Recurrence of prolonged pregnancy.
Mogren I, Stenlund H, H?berg U.
Department of Obstetrics and Gynecology, Ume?University, Sweden.
Background:
We conducted a cohort study in an attempt to determine
whether prolonged pregnancy in mother is a risk factor for prolonged
pregnancy in daughter, and if previous prolonged pregnancy is a risk
factor for prolonged pregnancy in subsequent pregnancy.
Methods:
Data
from the Swedish Medical Birth Registry were combined with a local
registry of births (1955-1990). Mother-daughter pairs (with events of
delivery in each generation) were identified. Relative risk (RR) and its
95% confidence interval (CI) were calculated and population attributable
proportion was estimated when appropriate.
Results:
If mother had had
prolonged pregnancy at delivery of daughter the relative risk (RR) of
prolonged pregnancy in daughter was moderately raised (RR = 1.3; CI :
1.0-1.7) with population attributable proportions ranging between 2.1%
and 4.6%. If previous pregnancy had been prolonged, the RR of prolonged
pregnancy at subsequent birth was increased 2-3 fold with population
attributable proportions of 12.5% to 15.8%. Possible confounders such as
mother's parity, age and maternal age did not alter the risks.
Conclusions:
Although moderate, prolonged pregnancy in mother may be a
risk factor for prolonged pregnancy in daughter. A previous prolonged
pregnancy increases the risk of prolonged pregnancy in a subsequent
birth. However, the familial factor of prolonged pregnancy explains just
a minor part of its occurrence in the population (due to small
population attributable proportions).
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