Objectives: To determine the frequency of postdate delivery and to explore the relationship between such frequency and mothers' anthropometric measures.
Patients & Methods: The study included all women completed their antenatal care and gave birth at Armed Forces Hospital, KSA since June 2008 till Sep 2010. Postdate was defined according to WHO recommendation as prolongation of pregnancy for more than 294 days. Body weight (Wt) and height (Ht) were determined for calculation of body mass index (BMI) at time of booking and at the end of the 3rd trimester and excess BMI gain percentage (EBMIG %) was calculated.
Results: The study included 1230 women with mean age of 27.8±2.5 years, mean body weight at time of booking was 84.9±5.7 kg and mean BMI 32.6±2.5 kg/m2. At time of booking, only 7 women (0.6%) were average weight, 272 (22.1%) were overweight, 745 (60.6%) were obese and 206 (16.7%) were morbidly obese. At the end of the 3rd trimester, all women gained weight with significantly higher body weight and BMI compared to that determined at time of booking and BMI strata were changed in direction of increased BMI. At the end of the 3rd trimester, 493 women had EBMIG% of 3.7±0.8; 0.4-4.9%, 677 women had EBMIG% of 6.8±1.3; 5.1-9.9%, 56 women had EBMIG% of 11±0.8; 10-13.6% and only 6 women had EBMIG% of 16.2±0.6; 15.2-16.6%. Using Receiver operating characteristic (ROC) curve analysis for differentiation of anthropometric measures as predictor for postdate delivery and need for aided or surgical delivery, defined BMI at time of booking as a sensitive predictor and EBMIG% at the end of the 3rd trimester as specific predictor. Logestic regression analysis confirmed the specificity of EBMIG% as the predictor for postdate delivery with significant difference compared to other variables.
Conclusion: Increased BMI at time of first examination during first trimester is a significant sensitive predictor for the possibility of prolonged duration of pregnancy beyond 290 days of gestation and high percentage of BMI gain at the end of 3rd trimester could be considered as specific predictor for prolongation of pregnancy duration and the increased need for induction of labor and aided or surgical delivery.
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