深圳16887例不同胎龄单胎新生儿克托莱指数研究

Study on the Quetelet index in 16,887 singleton neonates with different gestational age in Shenzhen City

目的制定不同胎龄单胎新生儿克托莱指数,为评价深圳新生儿出生时身体的匀称性提供参考数据。方法采用横断面调查,2013年4月-2015年9月在深圳两家医院整群抽样,完成16 887例(男9 418例,女7 469例)不同胎龄单胎新生儿体重、身长、顶臀长、头围、胸围现场测量,用以制定不同胎龄单胎新生儿克托莱指数。结果制定了2015年深圳胎龄27~42周单胎新生儿(男、女、性别混合)三分组的克托莱指数(Quetelet Index,QI)均数及其3rd^97th百分位曲线。男、女新生儿的QI数值在胎龄27周最低,随着胎龄增加QI数值不断增大,胎龄42周QI数值最大。胎龄27~42周每个孕周男性QI的50th曲线数值都高于女性,增加值范围1.17~1.83,胎龄35~41周增加值差异有统计学意义(t=2.73~8.85,P<0.01~<0.001)。结论深圳不同胎龄单胎新生儿QI值随胎龄增加指数值不断增大,提示胎龄增大人体密度和充实度不断提高。QI存在男高女低性别差异。

Objective To establish the Quetelet index （QI） of singleton neonates with different gestational age （GA） so as to provide reference data for evaluating enrichment degree of neonates at birth in Shenzhen. Methods A cross-sectional cluster sampling was performed in two hospitals from April 2013 to September 2015. Body weight, body length, crown-rump length, head circumference and chest circumference of 16,887 singleton neonates （including 9,418 boys and 7,469 girls） with different GA at birth were measured on the spot, and then the QI of singleton neonates with different GA was created. Results We plotted the QI mean values and 3^rd-97^th percentile intrauterine growth curves of singleton neonates withGA of 27-42 weeks and from three groups of male, female, and both sexes in Shenzhen in 2015. Male and female neonates with GA of 27 weeks had the lowest QI value, which gradually increased with the increasing GA and reached the highest at 42 weeks of GA. The value of QI 50^th curve at each gestational weekforneonates with GA of 27-42 weeks was higher in males than in females, and the increased values ranged between 1.17 and 1.83 and showed statistically significant differences in 35-41 weeks of GA （t=2.73-8.85, P〈0.01-P〈0.001）. Conclusions The QI values of singleton neonates with GA in Shenzhen are increased with the increasing GA, indicating that the body density and enrichment degree are also increased with the increasing GA. There exists a gender difference in the QI values, showing high values in males than in females.