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首页> 外文期刊>Sleep health. >High school start times after 8:30 am are associated with later wake times and longer time in bed among teens in a national urban cohort study
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High school start times after 8:30 am are associated with later wake times and longer time in bed among teens in a national urban cohort study

机译：上午8:30之后的高中开始时间与以后的唤醒时间和在国家城市队列研究中的青少年床上较长的时间有关

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Objectives: High school start times are a key contributor to insufficient sleep. This study investigated associations of high school start times with bedtime, wake time, and time in bed among urban teenagers. Design: Daily-diary study nested within the prospective Fragile Families and Child Wellbeing Study. Setting: Twenty US cities. Participants: Four hundred thirteen teenagers who completed >1 daily diary report on a school day. Measurements: Participating teens were asked to complete daily diaries for 7 consecutive days. School-day daily diaries (3.8 ±1.6 entries per person) were used in analyses (N = 1555 school days). High school start time, the main predictor, was categorized as 7:00-7:29 am (15%), 7:30-7:59 am (22%), 8:00-8:29 am (35%), and 8:30 am or later (28%). Multilevel modeling examined the associations of school start times with bedtime, wake time, and time in bed. Models adjusted for age, sex, race/ethnicity, household income, caregiver's education, and school type. Results: Teens with the earliest high school start times (7:00-7:29 am) obtained 46 minutes less time in bed on average compared with teens with high school start times at 8:30 am or later (P< .001). Teens exhibited a dose-response relationship between earlier school start times and shorter time in bed, primarily due to earlier wake times (P< .05). Start times after 8:30 am were associated with increased time in bed, extending morning sleep by 27-57 minutes (P < .05) when compared with teens with earlier school start times. Conclusion: Later school start times are associated with later wake times in our large, diverse sample. Teens starting school at 8:30 am or later are the only group with an average time in bed permitting 8 hours of sleep, the minimum recommended by expert consensus for health and well-being.
机译：目标：高中开始时间是导致睡眠不足的关键因素。这项研究调查了高中开始时间与就寝时间，唤醒时间和在城市青少年中躺在床上的时间。设计：日常研究嵌套在前瞻性脆弱的家庭和儿童健康研究中。环境：二十个美国城市。参与者：在上学日完成每日日记> 1次每日日记的四百名青少年。测量：要求参与的青少年连续7天完成每日日记。分析（n = 1555个上学日），使用了学校日的每日日记（每人3.8±1.6个条目）。高中开始时间，主要预测指标，分为7：00-7：29 AM（15％），7：30-7：59 AM（22％），8：00-8：29 AM（35％） ，以及上午8:30或更高版本（28％）。多级建模检查了学校起步时间与就寝时间，唤醒时间和床上时间的关联。针对年龄，性别，种族/种族，家庭收入，看护人的教育和学校类型进行调整的模型。结果：最早的高中开始时间（7：00-7：29 AM）的青少年平均降低了46分钟的时间，而在上午8:30或更高版本的高中开始时间（P <.001） 。青少年在较早的学校开始时间和床上较短的时间之间表现出剂量反应关系，这主要是由于较早的唤醒时间（p <.05）。与较早的学校开始时间相比，上午8:30之后的开始时间与床上的时间增加有关，将早晨睡眠延长27-57分钟（p <.05）。结论：以后的学校开始时间与我们大型，多样化的样本中的后来的唤醒时间有关。青少年从上午8:30或更晚开始上学，是唯一一个平均床上时间的人群，允许睡眠8个小时，这是专家共识以健康和福祉的最低建议。

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