Predictors for physical activity in adolescent girls using statistical shrinkage techniques for hierarchical longitudinal mixed effects models.
Predictors for physical activity in adolescent girls using statistical shrinkage techniques for hierarchical longitudinal mixed effects models.
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DOI：
10.1371/journal.pone.0125431
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Wu TT
中科院分区：
文献类型：
--
作者：
Grant EM;Young DR;Wu TT
我们研究了纵向，多层次变量和女孩的身体活动之间的关联，以确定不同青少年年龄的身体活动变化的重要预测因素。青春期女孩活动试验2研究（马里兰州）贡献了8年级（2009年）至11年级（2011年）的参与者（n=561）。问卷被用来获得人口统计学和心理社会信息（个人和社会层面的变量）;身高，体重和三头肌皮褶来评估身体成分;学校层面的数据访谈和调查;和自我报告的邻里水平的变量。通过加速度计评估中度至剧烈体力活动分钟数。一个双重正则化线性混合效应模型用于纵向多水平数据，以确定最重要的协变量的体力活动。从最初的66个变量中选择了个人层面的三个固定效应和学校层面的一个随机效应，其中包括47个固定效应和19个随机效应变量，以及时间效应。自我管理策略，感知障碍和朋友的社会支持是三个选定的固定效应，以及是否在中学提供校内或校际课程是选定的随机效应。心理社会因素、朋友支持、学校体育活动环境对青春期女生的中到剧烈体育活动有纵向影响。
We examined associations among longitudinal, multilevel variables and girls’ physical activity to determine the important predictors for physical activity change at different adolescent ages. The Trial of Activity for Adolescent Girls 2 study (Maryland) contributed participants from 8th (2009) to 11th grade (2011) (n=561). Questionnaires were used to obtain demographic, and psychosocial information (individual- and social-level variables); height, weight, and triceps skinfold to assess body composition; interviews and surveys for school-level data; and self-report for neighborhood-level variables. Moderate to vigorous physical activity minutes were assessed from accelerometers. A doubly regularized linear mixed effects model was used for the longitudinal multilevel data to identify the most important covariates for physical activity. Three fixed effects at the individual level and one random effect at the school level were chosen from an initial total of 66 variables, consisting of 47 fixed effects and 19 random effects variables, in additional to the time effect. Self-management strategies, perceived barriers, and social support from friends were the three selected fixed effects, and whether intramural or interscholastic programs were offered in middle school was the selected random effect. Psychosocial factors and friend support, plus a school’s physical activity environment, affect adolescent girl’s moderate to vigorous physical activity longitudinally.
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影响因子：
2.4
作者：
Elder, John P.;Lytle, Leslie;Ribisl, Kurt
通讯作者：
Ribisl, Kurt
DOI：
10.5641/193250308x13086753542735
发表时间：
2008-03-01
影响因子：
2.2
作者：
Barr-Anderson, Daheia J.;Neumark-Sztainer, Dianne;Pate, Russell R.
通讯作者：
Pate, Russell R.
DOI：
10.1097/00004583-199107000-00017
发表时间：
1991-07-01
影响因子：
13.3
作者：
GARRISON, CZ;ADDY, CL;WALLER, JL
通讯作者：
WALLER, JL
影响因子：
5.5
作者：
Motl, RW;Dishman, RK;Pate, RR
通讯作者：
Pate, RR
影响因子：
2.3
作者：
Birnbaum, AS;Evenson, KR;Dowda, M
通讯作者：
Dowda, M