Sleep and BMI in South African urban and rural, high and low-income preschool children
| dc.contributor.author | Rae, Dale E | |
| dc.contributor.author | Tomaz, Simone A | |
| dc.contributor.author | Jones, Rachel A | |
| dc.contributor.author | Hinkley, Trina | |
| dc.contributor.author | Twine, Rhian | |
| dc.contributor.author | Kahn, Kathleen | |
| dc.contributor.author | Norris, Shane A | |
| dc.contributor.author | Draper, Catherine E | |
| dc.date.accessioned | 2021-03-31T22:39:42Z | |
| dc.date.available | 2021-03-31T22:39:42Z | |
| dc.date.issued | 2021-03-23 | |
| dc.date.updated | 2021-03-28T03:08:09Z | |
| dc.description.abstract | Abstract Background The extent to which income setting or rural and urban environments modify the association between sleep and obesity in young children is unclear. The aims of this cross-sectional observational study were to (i) describe and compare sleep in South African preschool children from rural low-income (RL), urban low-income (UL) and urban high-income (UH) settings; and (ii) test for associations between sleep parameters and body mass index (BMI). Methods Participants were preschoolers (5.2 ± 0.7y, 49.5% boys) from RL (n = 111), UL (n = 65) and UH (n = 22) settings. Height and weight were measured. Sleep, sedentary behaviour and physical activity were assessed using accelerometery. Results UL children had higher BMI z-scores (median: 0.39; interquartile range: − 0.27, 0.99) than the UH (− 0.38; − 0.88, 0.11) and RL (− 0.08; − 0.83, 0.53) children (p = 0.001). The UL children had later bedtimes (p < 0.001) and wake-up times (p < 0.001) and shorter 24 h (p < 0.001) and nocturnal (p < 0.001) sleep durations than the RL and UH children. After adjusting for age, sex, setting, SB and PA, for every hour less sleep obtained (24 h and nocturnal), children were 2.28 (95% CI: 1.28–4.35) and 2.22 (95% CI: 1.27–3.85) more likely, respectively, to belong to a higher BMI z-score quartile. Conclusions Shorter sleep is associated with a higher BMI z-score in South African preschoolers, despite high levels of PA, with UL children appearing to be particularly vulnerable. | |
| dc.identifier.apacitation | Rae, D. E., Tomaz, S. A., Jones, R. A., Hinkley, T., Twine, R., Kahn, K., ... Draper, C. E. (2021). Sleep and BMI in South African urban and rural, high and low-income preschool children. <i>BMC Public Health</i>, 23(1), 571. http://hdl.handle.net/11427/33208 | en_ZA |
| dc.identifier.chicagocitation | Rae, Dale E, Simone A Tomaz, Rachel A Jones, Trina Hinkley, Rhian Twine, Kathleen Kahn, Shane A Norris, and Catherine E Draper "Sleep and BMI in South African urban and rural, high and low-income preschool children." <i>BMC Public Health</i> 23, 1. (2021): 571. http://hdl.handle.net/11427/33208 | en_ZA |
| dc.identifier.citation | Rae, D.E., Tomaz, S.A., Jones, R.A., Hinkley, T., Twine, R., Kahn, K., Norris, S.A. & Draper, C.E. et al. 2021. Sleep and BMI in South African urban and rural, high and low-income preschool children. <i>BMC Public Health.</i> 23(1):571. http://hdl.handle.net/11427/33208 | en_ZA |
| dc.identifier.ris | TY - AU - Rae, Dale E AU - Tomaz, Simone A AU - Jones, Rachel A AU - Hinkley, Trina AU - Twine, Rhian AU - Kahn, Kathleen AU - Norris, Shane A AU - Draper, Catherine E AB - Abstract Background The extent to which income setting or rural and urban environments modify the association between sleep and obesity in young children is unclear. The aims of this cross-sectional observational study were to (i) describe and compare sleep in South African preschool children from rural low-income (RL), urban low-income (UL) and urban high-income (UH) settings; and (ii) test for associations between sleep parameters and body mass index (BMI). Methods Participants were preschoolers (5.2 ± 0.7y, 49.5% boys) from RL (n = 111), UL (n = 65) and UH (n = 22) settings. Height and weight were measured. Sleep, sedentary behaviour and physical activity were assessed using accelerometery. Results UL children had higher BMI z-scores (median: 0.39; interquartile range: − 0.27, 0.99) than the UH (− 0.38; − 0.88, 0.11) and RL (− 0.08; − 0.83, 0.53) children (p = 0.001). The UL children had later bedtimes (p < 0.001) and wake-up times (p < 0.001) and shorter 24 h (p < 0.001) and nocturnal (p < 0.001) sleep durations than the RL and UH children. After adjusting for age, sex, setting, SB and PA, for every hour less sleep obtained (24 h and nocturnal), children were 2.28 (95% CI: 1.28–4.35) and 2.22 (95% CI: 1.27–3.85) more likely, respectively, to belong to a higher BMI z-score quartile. Conclusions Shorter sleep is associated with a higher BMI z-score in South African preschoolers, despite high levels of PA, with UL children appearing to be particularly vulnerable. DA - 2021-03-23 DB - OpenUCT DP - University of Cape Town KW - Sleep KW - Adiposity KW - Early childhood KW - Low- and middle-income country LK - https://open.uct.ac.za PY - 2021 T1 - Sleep and BMI in South African urban and rural, high and low-income preschool children TI - Sleep and BMI in South African urban and rural, high and low-income preschool children UR - http://hdl.handle.net/11427/33208 ER - | en_ZA |
| dc.identifier.uri | https://doi.org/10.1186/s12889-021-10591-5 | |
| dc.identifier.uri | http://hdl.handle.net/11427/33208 | |
| dc.identifier.vancouvercitation | Rae DE, Tomaz SA, Jones RA, Hinkley T, Twine R, Kahn K, et al. Sleep and BMI in South African urban and rural, high and low-income preschool children. BMC Public Health. 2021;23(1):571. http://hdl.handle.net/11427/33208. | en_ZA |
| dc.language.rfc3066 | en | |
| dc.rights.holder | The Author(s) | |
| dc.source | BMC Public Health | |
| dc.source.journalissue | 1 | |
| dc.source.journalvolume | 23 | |
| dc.source.pagination | 571 | |
| dc.source.uri | https://bmcpublichealth.biomedcentral.com/ | |
| dc.subject | Sleep | |
| dc.subject | Adiposity | |
| dc.subject | Early childhood | |
| dc.subject | Low- and middle-income country | |
| dc.title | Sleep and BMI in South African urban and rural, high and low-income preschool children | |
| dc.type | Journal Article |