关键词: 新生儿, 胎龄别头围, 修匀百分位数

Abstract: Objective To establish population-based percentile curves for gestational-age specific head circumference of newborns. Methods Data were collected from November 1^st 2009 to January 21^st 2011 in Shunyi District Hospital of Beijing and Shunyi Maternal and Child Health Hospital.All newborns who were born in these two hospitals were taken standard physical measurements.Strict quality control was essential for assurance of the quality of data.LMS program was used to smooth the percentile curve.And the results with investigation results of 15 cities of China in 1986-1987 were also compared. Results A total of 5 201 subjects were engaged.Percentiles at P₃,P₁₀,P₂₅,P₅₀,P₇₅,P₉₀,P₉₇ of head circumference were calculated,and the corresponding reference curves for gestational age-specific and gender-specific were successfully smoothed.Differences of head circumference between boys and girls were significant at 37~41 weeks,head circumference values were higher in boys.But our measurements were lower than the investigation results of 15 cities of China in 1986-1987. Conclusion Gestational age-specific and gender-specific percentiles are presented in this study.And it would be proposed a current reference for the local clinicians and researchers to evaluate fetal growth.

Key words: newborn, gestational age-specific head circumference, smooth percentiles