Change in the miscarriage rate, live birth rate per cycle started, or the multiple pregnancy rate.
流产率，已启动的周期活胎出生率或多胎妊娠率的变化。
The riskfactors of LBW rate included multiple fetus, multiple parturition, inadequate duration of pregnancy, high altitude, low GNP and maternal anemia, et al.
本次调查低出生体重率的危险因素有多胎、多产次、 孕周不足、高海拔、低国民生产总值及妇女贫血等。
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