ABSTRACT
Objectives: To evaluate the impact of
body mass index (BMI) on the timing
of labor in relation to the due date of
delivery.
Patients & Methods: 553 women were
evaluated for baseline BMI and classified according to WHO classification.
At the time of delivery, BMI was reevaluated and excess BMI gain was
determined. Time of delivery in relation to the due date of delivery and the
incidence of preterm delivery (PTD)
and postdate delivery (PDD) were determined. The relation between time
of delivery and at-booking BMI was
studied and Kaplan-Meier regression
analysis was used to determine the
cumulative risk of PTD and PDD at
various values of BMI.
Results: 35 parturient (6.33%) had
PTD with mean gestational age (GA)
of 239.8±8.65 days and 20 parturient
had PDD at GA of 296.5±1.55 days.
Eighteen under and average weights
parturient had PTD, while 17 overweight-to-obese II parturient had
PTD. PDD was prevalent among overweight-to-obese II parturient. There
was a significant correlation between
at-booking BMI and incidence of PTD
and PDD and Kaplan-Meier regression analysis showed a progressive
increase of PTD risk with increased at
-booking BMI and risk was 40% for
women with BMI of 35 kg/m2
and
80% for women with BMI >35 kg/m2
.
Also, the risk of PDD was 100% in
women with a BMI of >35 but |
