Educational Leadership, Policy, and Instructional Technology, Central Connecticut State University, New Britain, CT.
Educational Leadership, Policy, and Instructional Technology, Central Connecticut State University, New Britain, CT.
Sleep Health. 2017 Apr;3(2):119-125. doi: 10.1016/j.sleh.2017.01.002. Epub 2017 Feb 1.
The first purpose of this study was to investigate changes in high school graduation rates with a delayed school start time of later than 8:30am. The second aim of the study was to analyze the association between a delayed high school start time later than 8:30am and attendance rates.
In the current study, a pre-post design using a repeated-measures analysis of variance was used to examine changes in attendance and graduation rates 2 years after a delayed start was implemented.
Public high schools from 8 school districts (n=29 high schools) located throughout 7 different states. Schools were identified using previous research from the Children's National Medical Center's Division of Sleep Medicine Research Team.
A total membership of more than 30,000 high school students enrolled in the 29 schools identified by the Children's National Medical Center's Research Team. A pre-post design was used for a within-subject design, controlling for any school-to-school difference in the calculation of the response variable. This is the recommended technique for a study that may include data with potential measurement error.
Findings from this study linked a start time of later than 8:30am to improved attendance rates and graduation rates.
Attendance rates and graduation rates significantly improved in schools with delayed start times of 8:30am or later. School officials need to take special notice that this investigation also raises questions about whether later start times are a mechanism for closing the achievement gap due to improved graduation rates.
本研究的首要目的是调查高中毕业率在推迟至 8:30 以后的上学时间后的变化。本研究的第二个目的是分析推迟至 8:30 以后的高中上学时间与出勤率之间的关联。
在本研究中，采用重复测量方差分析的前后设计，以检查实施推迟上学后 2 年出勤率和毕业率的变化。
来自 7 个不同州的 8 个学区的公立高中（n=29 所高中）。这些学校是根据儿童国家医学中心睡眠医学研究小组的先前研究确定的。
共有超过 30000 名高中生参加了儿童国家医学中心研究小组确定的 29 所学校。采用前后设计进行了个体内设计，在计算因变量时控制了任何学校间的差异。对于可能存在测量误差的数据，这是一种推荐的研究方法。
本研究的结果表明，较晚的上学时间（8:30 以后）与提高出勤率和毕业率有关。
推迟到 8:30 或更晚的上学时间，显著提高了出勤率和毕业率。学校官员需要特别注意，这一调查也提出了关于推迟上学时间是否是由于提高毕业率而缩小成绩差距的一种机制的问题。
