5. Treatment was effectie with serum folate concentrations increasing by 576% and plasma homocysteine falling by 26% for the folic acid group compared with placebo.

• 这句话没翻译。试译：叶酸治疗组与安慰剂组比较，血清叶酸浓度增加576%25且血浆同型半胱氨酸水平下降26%25视为治疗有效。