试验组的总有效率高于对照组，优效性检验成立。
The test group had a higher overall effective rate than the control group.
方法：采用随机、双盲、安慰剂平行组对照、剂量反应研究设计和优效性检验。
METHODS: Cortex fraxini total coumarin was involved in a randomized, double-blind, placebo parallel control, dosage-reaction design and superiority test.
方法：采用随机、双盲、安慰剂平行组对照、剂量反应研究设计和优效性检验。
METHODS: Cortex fraxini total coumarin was involved in a randomized, double-blind, placebo parallel control, dosage-reaction design and superiority test.
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