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目的:探讨我国不同胎龄胎儿身长孕周均值时间段增长趋势及性别差异规律。方法:根据1986年中国15城市不同胎龄新生儿身长均值和2005年深圳不同胎龄初生儿身长均值进行综合分析。结果:在孕28～31周胎龄段,2005年深圳初生儿身长孕周均值低于1986年中国15城市新生儿身长孕周均值,平均每个孕周均值减少1.4 cm;在孕32～44周胎龄段,深圳初生儿身长孕周均值高于1986年中国15城市新生儿身长孕周均值,平均每个孕周均值增加0.5 cm,t检验,P<0.01、<0.05占大多数。2005年深圳不同胎龄初生儿男与女身长孕周均值比较,在17个孕周分组中,除孕32周男低于女、孕30周男女均值相同外,其余的15个孕周都是男高于女,平均每个孕周男比女增加0.8 cm。经t检验,P<0.01、<0.05占多数。结论:2005年深圳不同胎龄初生儿(男+女)孕32～44周胎龄段的身长孕周均值比1986年中国15城市身长孕周均值有显著的提高。我国不同胎龄胎儿身长发育均值明显受到籍贯因素的影响,存在地区差异,又存在明显的时间段(19年间隔)增长趋势规律。我国不同胎龄胎儿在孕28～44周胎龄段,身长均值存在明显男高女低的性别差异规律。
Objective: To investigate the growth trend and gender differences of gestational weeks in different gestational age fetuses in China. Methods: According to the mean body length of newborns with different gestational ages in 15 cities of China in 1986 and the mean body length of newborns of different gestational age in Shenzhen in 2005, a comprehensive analysis was made. Results: The gestational age at gestational age ranged from 28 to 31 gestations in 2005. The average length of gestational age of newborns in Shenzhen in 2005 was lower than that of average birth weight of newborns in 15 cities in China in 1986, with an average of 1.4 cm for each gestational age. In gestational age ranged from 32 to 44 Weekly gestational age, gestational age at birth in Shenzhen, mean gestational age was higher than that of 1986 China 15 cities, the average gestational age of newborns, an average of 0.5 cm per gestational week, t test, P <0.01, <0.05 accounted for the majority. In 2005, the average gestational ages of male and female of different gestational age newborns in Shenzhen were compared. In the 17 gestational weeks group, the average gestational age was lower Men were higher than women, with an average increase of 0.8 cm for each gestational age. After t test, P <0.01, <0.05 accounted for the majority. CONCLUSION: The average gestational age of 32 gestational age gestational age in different gestational age neonates (male + female) in Shenzhen in 2005 was significantly higher than that of 1986 gestational age in 15 Chinese cities. The mean growth of fetuses of different gestational age fetuses in China is obviously affected by native factors. There are regional differences, and there is an obvious trend of increasing trend in time (19 years interval). China’s different gestational age fetuses at gestational age of 28 to 44 weeks gestational age, there is a significant difference in height of male and female gender differences in the law.