Impact of delaying high school start times on weight and related behaviors - the START study.
Adolescents
BMI
Natural experiment
Obesity
Overweight
School policy
School start time
Journal
Preventive medicine
ISSN: 1096-0260
Titre abrégé: Prev Med
Pays: United States
ID NLM: 0322116
Informations de publication
Date de publication:
07 2023
07 2023
Historique:
received:
25
11
2022
revised:
03
04
2023
accepted:
15
05
2023
pmc-release:
01
07
2024
medline:
2
6
2023
pubmed:
19
5
2023
entrez:
18
5
2023
Statut:
ppublish
Résumé
In the US, few adolescents get adequate school night sleep, largely due to early school start times. In the START study we aimed to test the following hypothesis: That following the implementation of later high school start times students have lesser longitudinal increases in body mass index (BMI) and shift to more healthful weight-related behaviors relative to students attending schools that retain early start times. The study enrolled a cohort of students (n = 2426) in five high schools in the Twin Cities, MN metro. Heights and weights were measured objectively, and surveys were administered annually from 9th through 11th grades (2016-2018). All study schools started early (either 7:30 am or 7:45 am) at baseline (2016). At follow-up 1 (2017) and continuing through follow-up 2 (2018), two schools delayed their start times by 50-65 min, while three comparison schools started at 7:30 am throughout the observation period. Using a difference-in-differences natural experiment design, we estimated differences in changes in BMI and weight-related behaviors over time between policy change and comparison schools. Students' BMIs increased in parallel in both policy change and comparison schools over time. However relative to changes in comparison schools after the start time shift, students in policy change schools had a modestly more healthful profile of weight-related behaviors - for instance they had a relatively greater probability of eating breakfast, having supper with their family, getting more activity, eating fast food less frequently, and eating vegetables daily. Later start times could be a durable, population-wide strategy that promotes healthful weight behaviors.
Identifiants
pubmed: 37201593
pii: S0091-7435(23)00128-7
doi: 10.1016/j.ypmed.2023.107548
pmc: PMC10319406
mid: NIHMS1906222
pii:
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
107548Subventions
Organisme : NICHD NIH HHS
ID : P2C HD041023
Pays : United States
Organisme : NICHD NIH HHS
ID : R01 HD088176
Pays : United States
Informations de copyright
Copyright © 2023 Elsevier Inc. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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