To analyse the relationship
between unplanned pregnancy and maternal Body Mass Index (BMI).
A
prospective case-control study of planned vs. unplanned pregnancies among women
who delivered an infant weighing ≥ 500 g during the four years 2009-2012 in a
large maternity hospital in Ireland. Maternal weight and height were measured
at the first antenatal visit before calculation of BMI. Clinical and
sociodemographic details were computerised. BMI was categorised according to
the World Health Organization. The epidemiological associations were examined
using logistic regression, adjusted for confounding variables.
Between
2009 and 2012, 34,377 women were included, 31.7% (n = 10,894) reported an
unplanned pregnancy and 16.6% (n = 5647) were obese. The odds ratios of
unplanned pregnancy were greater among obese women compared with those of
normal BMI. These ratios increased with increasing BMI. The higher
rate of unplanned pregnancy among obese women was associated with a lower rate
of contraception usage and a higher rate of contraceptive failure. Only 37.6%
(n = 2112) of obese women took preconceptional folic acid to prevent neural
tube defects compared with 46.1% (n = 8176) of women with a normal BMI (p <
0.001).
Higher rates of unplanned pregnancy among obese women
compared with women with a normal BMI is associated with compromised
prepregnancy care in this high-risk population.
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By:
- 1 UCD Centre for Human Reproduction, Coombe Women and Infants University Hospital , Dublin , Ireland.
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