它们均随著出生体重和怀孕周数的增加而增加。
They increased linearly with increasing birth weight and gestational age.
他们大多为出生体重小于1300公克或怀孕周数少于32周之早产儿。
All these babies were less than 1300 GMS in birth weight or under 32 weeks in gestation ages.
对其进行了体检、产前实验室化验和人体测量，采用B超测定怀孕周数以确定其合格性。
Physical examinations, antenatal laboratory tests and anthropometric measures were performed, and gestational age was determined by ultrasound to confirm eligibility.
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