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As a result, adverse outcomes currently believed to be associated with low rate of weight gain may instead be more likely to be attributable to a young gestational age at birth. It is unclear, however, if this theoretical bias is large enough in magnitude to have a meaningful impact on our substantive understanding of the contribution of gestational weight gain to important pregnancy outcomes. The goal of this study was to quantify the degree of bias that conventional gestational weight http://www.selleckchem.com/products/Bafetinib.html gain measures may introduce to the apparent relationship between gestational weight gain and risk of preterm birth ��32 weeks. Pregnancy information on a large population-based cohort of pregnant women was obtained from the British Columbia (BC) Perinatal Database Registry, which contains obstetrical and neonatal clinical chart data on all births in this Canadian province.13 The characteristics of these women are provided in Appendix?A. Analyses were restricted to women with a normal-weight prepregnancy BMI (18.5�C24.9?kg/m2, inclusive), and stillbirths were excluded. Very preterm birth was defined as a livebirth ��32 completed weeks of gestation. Sensitivity analyses were conducted using an outcome of any preterm birth (livebirth http://en.wikipedia.org/wiki/MYO10 weight gain patterns in a contemporary cohort of pregnant women were obtained from a sample of 818 women of normal-weight prepregnancy BMI who delivered a singleton birth at Magee-Womens Hospital in Pittsburgh, PA, US, and for whom serial antenatal weight gain measurements were available. Stillbirths, preterm births ( http://www.selleckchem.com/products/bay80-6946.html weight gain in the cohort was 15.4?kg?��?6. The serial gestational weight gain measurements (an average of 11 per woman) were smoothed to obtain means and standard deviations of gestational weight gain at each week of gestation (Table?1). As all women in this cohort delivered at term, estimates of the week-specific means and standard deviations of gestational weight gains at preterm gestational ages were independent of the risk of preterm birth. In the second step of our simulation, the week-specific means and standard deviations of gestational weight gain were used to simulate a total gestational weight gain for women in our BC cohort based on their gestational age at delivery. For example, in the Magee-Womens cohort, the average gestational weight gain by 28 weeks was 11.0?kg with a standard deviation of 4.3?kg.