Dataset Information

Association between Diurnal Variation of Ozone Concentration and Stroke Occurrence: 24-Hour Time Series Study.

ABSTRACT: BACKGROUND AND PURPOSE:Increasing ozone concentrations have been known to damage human health and ecosystems. Although ozone tends to display diurnal variation, most studies have reported only on the association between daily ozone concentrations and ischemic stroke occurrence on the same day, or with a 1-day lag. We investigated the effect of the diurnal variation of ozone on ischemic stroke occurrence during the same day. METHODS:We included a consecutive series of 1,734 patients from January 1, 2008, to December 31, 2014, at a single tertiary hospital in Seoul, South Korea. We evaluated differences between temperature and pollutants at the time of stroke onset for each time interval and averaged those parameters across the 7-year study period. RESULTS:During the interval from 13:00 to 16:59, we found a positive association between ischemic stroke occurrence and ozone concentration relative to other time periods. Upper median ozone levels from 13:00 to 16:59 were positively correlated with ischemic stroke (odds ratio, 1.550; 95% confidence intervals, 1.220 to 1.970; P = <0.001) when compared with lower median levels. CONCLUSIONS:The results show diurnal patterns of ischemic stroke occurrence based on upper and lower median ozone levels for a 24-hour period, which extends understanding of the association between stroke occurrence and environmental influences.

SUBMITTER: Han MH

PROVIDER: S-EPMC4807846 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Association between Diurnal Variation of Ozone Concentration and Stroke Occurrence: 24-Hour Time Series Study.

Han Myung-Hoon MH Yi Hyeong-Joong HJ Kim Young-Seo YS Ko Yong Y Kim Young-Soo YS

PloS one 20160325 3

<h4>Background and purpose</h4>Increasing ozone concentrations have been known to damage human health and ecosystems. Although ozone tends to display diurnal variation, most studies have reported only on the association between daily ozone concentrations and ischemic stroke occurrence on the same day, or with a 1-day lag. We investigated the effect of the diurnal variation of ozone on ischemic stroke occurrence during the same day.<h4>Methods</h4>We included a consecutive series of 1,734 patient ...[more]

PMID: 27015421

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Project description:Background The time that children spend in physical activity, sedentary behaviour, and sleep each day (i.e., 24-h time-use behaviours), is related to physical and mental health outcomes. Currently, there is no comprehensive evidence on New Zealand school-aged children’s 24-h time-use behaviours, adherence to the New Zealand 24-h Movement Guidelines, and how these vary among different sociodemographic groups. Methods This study utilises data from the 8-year wave of the Growing Up in New Zealand longitudinal study. Using two Axivity AX3 accelerometers, children’s 24-h time-use behaviours were described from two perspectives: activity intensity and activity type. Compositional data analysis techniques were used to explore the differences in 24-h time-use compositions across various sociodemographic groups. Results Children spent on average, 31.1%, 22.3%, 6.8%, and 39.8% of their time in sedentary, light physical activity, moderate-to-vigorous physical activity, and sleep, respectively. However, the daily distribution of time in different activity types was 33.2% sitting, 10.8% standing, 7.3% walking, 0.4% running, and 48.2% lying. Both the activity intensity and activity type compositions varied across groups of child ethnicity, gender, and household income or deprivation. The proportion of children meeting each of the guidelines was 90% for physical activity, 62.5% for sleep, 16% for screen time, and 10.6% for the combined guidelines. Both gender and residence location (i.e., urban vs. rural) were associated with meeting the physical activity guideline, whereas child ethnicity, mother’s education and residence location were associated with meeting the screen time guideline. Child ethnicity and mother’s education were also significantly associated with the adherence to the combined 24-h Movement Guidelines. Conclusions This study provided comprehensive evidence on how New Zealand children engage in 24-h time-use behaviours, adherence to the New Zealand 24-h Movement Guidelines, and how these behaviours differ across key sociodemographic groups. These findings should be considered in designing future interventions for promoting healthy time-use patterns in New Zealand children. Supplementary Information The online version contains supplementary material available at 10.1186/s12966-022-01358-1.

Dataset Information

Association between Diurnal Variation of Ozone Concentration and Stroke Occurrence: 24-Hour Time Series Study.

Publications

Association between Diurnal Variation of Ozone Concentration and Stroke Occurrence: 24-Hour Time Series Study.

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