Objective To establish population-based body mass index (BMI) centiles for gestational age specific newborns. Methods All the newborns born in Shunyi District Hospital and Shunyi Maternal and Child Hospital during 1 November 2009 to 21 January 2011 were taken standard measurement of birth weight and length.The newborns meeting the criteria were selected to create database.K-median-coefficent of variation method was used to smooth the percentile curves.Comparison was made with a Brazil's research. Results Percentiles at P3, P10, P25, P50, P75, P90, P93 of BMI were calculated, the curves for each gestational age were successfully smoothed.Differences of BMI between genders were not statistically significant.The BMI values for gestational age in all percentiles showed a steady increase up to 38 weeks, levels off up to the 40th week, followed by a slight decrease to the 42nd week in both genders. Conclusion Recent percentiles for gestational age specific BMI of newborns are presented in this research, and it can be used as a BMI normative reference for the local clinicians.
Key words
gestational age /
newborn /
body mass index /
smoothed percentiles
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