出生缺陷发生率随着孕产次的增加而明显提高。
The prevalence rates increased with increasing gravidity or parity.
我们评估了在强化补充叶酸前后神经管缺陷发生率的变化。
We assessed changes in the prevalence of neural-tube defects in Canada before and after food fortification with folic acid was implemented.
慢性前列腺炎患者社会功能情况：社会功能缺陷发生率为26.5%。
Social functional condition of patients with chronic prostatitis: The incidence of social functional defect was 26.5%.
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