Methods All children were divided into three groups according to their age and to observe their hypnagogic time after they take chloral hydrate orally. The age plotting was 0~1 years old、~3 years old and ~6 years old respectively.
方法 把患儿分成 0~ 1,~ 3,~ 6岁 3组 ,观察患儿口服水合氯醛后的入睡时间。