低出生体重婴儿体重指数的动态变化及其临床意义

Dynamic Changes of Body Mass Index in Infants With Low Birth Weight.

【目的】 观察不同出生体重儿在婴儿期体重指数 (BMI)的变化规律 ,探讨低出生体重婴儿在婴儿期是否具有肥胖趋势。 【方法】 对 10 7例不同出生体重儿跟踪随访一年 ,观察出生时、6个月、9个月及 1岁时的BMI,采用SPSS统计软件进行分析。 【结果】 正常足月儿各时期BMI均值无性别差异 ,6个月时BMI达高峰 ,此后逐渐下降 ,1岁时BMI与出生时体重、身长、BMI呈显著正相关。巨大儿出生时BMI显著增高 ,但 6个月后维持正常高水平。低出生体重儿生后 9个月内BMI呈追赶趋势 ,1岁时其BMI明显低于对照组。 【结论】 婴儿期BMI与出生时体重、身长、BMI呈正相关 ,低出生体重儿在婴儿期虽然存在BMI的追赶现象 。

To study the dynamic changes of body mass index (BMI) in infants with low birth weight (LBW), so as to explore if there was a potentiality of obesity in those infants. The heights and weights were measured exactly at birth, 6th month, 9th month and 1 year after birth respectively in 107 infants. Then BMI was calculated and correlative analyses were done between BMI at 1 year and height, weight, BMI at birth, parents' heights, weights and their educational level. In infants with normal birth weight (NBW), the BMI at 1 year after birth was correlated positively to the BMI, weight and height at birth( r =0.315, 0.370, 0.339, respectively, P <0.05), but not significantly related to parents' height, weight and educational level. The level of BMI was the highest at 6th month, and then decreases significantly at 9th month ( P <0.01) and 1 year( P <0.05) after birth. The averages of BMI in infants with LBW were significantly lower than those BMI in infants with NBW except at 9th month. [Conclusions] BMI of infant at 1 year after birth was correlative to birth weight, height and BMI at birth. There was a potential of catching up with in BMI at 6 month after birth in infants with LBW. But their BMI was still significantly lower than those of infants with NBW except at 9 month, which indicated that there was no potentiality of obesity during the first year after birth in infants with LBW. BMI of infant was correlative to birth weight.