Relative risk (RR) was used as a measure of the effect of folic acid supplementation on the risk of stroke with a random effect model.
Relative risk (RR) was used as a measure of the effect of folic acid supplementation on the risk of stroke with a random effect model.
采用相对危险度（RR）的大小，作为衡量叶酸补充治疗在降低卒中发生危险有效性的指标。