体重低于同年龄、同性别参照人群的均值减2SD以下为体重低下。
...995年“全国提高儿童生命质量学术会议”决定，我国也参照WTO关于儿童营养不良体格测量的评估标准：(1)体重低下(underweight)：根据年龄性别体重，与同年龄、同性别正常参照值相比，低于中位数减2个标准差，但高于或等于中位数减3个标准差者为中度体重低下...
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同时因为儿时饮食质量低下导致无法发育到正常身高和体重的人数也在下降。
Fewer people fail to grow to their proper height and weight because of poor childhood diets.
胎龄小、体重低、胃肠道动力功能差及局部免疫应答能力低下、感染仍是NEC发病重要的影响因素。
Risk factors including the prematurity, low birth weight, immature intestinal immune function and poor motility, and bacterial infection bad been associated with the development of NEC.
肥胖女性生育能力低下的风险比体重正常女性高78%，同样的，此风险在肥胖男性身上也有增高，为49%。
Obese women had a 78% greater risk of being sub-fertile than normal-weight women, and obese men had a 49% increased risk for sub-fertility than normal-weight men.
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