Correlates of sedentary time in children: a multilevel modelling approach

BMC Public Health

José Maia³  Peter Todd Katzmarzyk²  Raquel Chaves⁴  Sara Pereira³  Daniel Santos³  Fernanda Karina dos Santos¹  Thayse Natacha Gomes³ 

[1] CAPES Foundation, Ministry of Education of Brazil, Brasília, DF, Brazil;Pennington Biomedical Research Center, 6400 Perkins Road, Baton Rouge, LA 70808-4124, USA;CIFI2D, Faculty of Sport, University of Porto, Rua Dr Plácido Costa, 91, Porto 4200-450, Portugal;Federal University of Technology – Paraná (UTFPR), Campus Curitiba, Curitiba, Brazil

关键词: Multilevel modelling;    School;    Children;    Sedentary behaviour;   

Others  :  1128146
DOI  :  10.1186/1471-2458-14-890

 received in 2014-03-11, accepted in 2014-08-26,  发布年份 2014

【 摘 要 】

Background

Sedentary behaviour (SB) has been implicated as a potential risk factor for chronic disease. Since children spend most of their awake time in schools, this study aimed to identify individual- and school-level correlates of sedentary time using a multilevel approach, and to determine if these correlates have a similar effect in normal weight (NW) and overweight/obese (O/O) children.

Methods

Sample comprised 686 Portuguese children aged 9-10 years from 23 schools that took part in the ISCOLE project. Actigraph GT3X + accelerometers were used 24 hours/day for 7 days to assess sedentary time (daily minutes <100 counts/min); BMI was computed and WHO cut-points were used to classify subjects as NW or O/O. Sex, BMI, number of siblings, family income, computer use on school days, and sleep time on school days were used as individual-level correlates. At the school level, school size (number of students), percentage of students involved in sports or physical activity (PA) clubs, school promotion of active transportation, and students’ access to equipment outside school hours were used. All multilevel modelling analysis was done in SPSS, WINPEPI, and HLM.

Results

School-level correlates explain ≈ 6.0% of the total variance in sedentary time. Results (β ± SE) showed that boys (-30.85 ± 5.23), children with more siblings (-8.56 ± 2.71) and those who sleep more (-17.78 ± 3.06) were less sedentary, while children with higher family income were more sedentary (4.32 ± 1.68). At the school level, no variable was significantly correlated with sedentary time. Among weight groups, variables related to sedentary time in NW were sex, sleep time and family income, while in O/O sex, number of siblings and sleep time were significant correlates. No school-level predictors were significantly associated in either of the weight groups.

Conclusion

Notwithstanding the relevance of the school environment in the reduction of children’s sedentary time, individual and family characteristics played a more relevant role than the school context in this study.

【 授权许可】

   
2014 Gomes et al.; licensee BioMed Central Ltd.

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