【Objective】 To establish population-based smoothed centiles for gestational age specific birthweight of newborns. 【Methods】 All newborns should be taken standard measurement of birthweight during 1 November 2009 to 21 January 2011 in Shunyi District Hospital of Beijing and Shunyi Maternal and Child Health Hospital. The newborns whose mother up to the standards of normal mother were selected to establish database. λ-median-coefficent of variation method was used to smooth the percentile curves. Compare smoothed centiles with neonatal physique growth investigation results of 15 cities of China in 1986-1987. 【Results】 5 068 live births were selected for final analysis. Percentiles at P3, P10, P25, P50, P75, P90, P97 of birthweight were calculated and described and the curves for each gestational-age were successfully smoothed. In general gender differences of birthweight were statistically significant; According to the analysis by gestational age, gender differences in the 38~42 gestational weeks were statistically significant. The incidences of small for gestational age infants and large for gestational age infants are 9.39% and 9.21%. Compared smoothed percentiles with the investigation results of 15 cities, differences of birthweight in 35~43 gestational weeks were statistically significant. 【Conclusions】 Recent percentiles for gestational age specific birthweight of newborns are presented and a current reference is proposed for the local clinicians and researchers to evaluate fetal growth.
Key words
birthweight /
smooth pertentiles /
newborn
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