They increased linearly with increasing birth weight and gestational age.
2
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.
3
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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