A largely unexplored application of“Big Data”in urban contexts is using human mobility data to study temporal heterogeneity in intercity travel networks.Hence,this paper explores China’s intercity travel patterns a...A largely unexplored application of“Big Data”in urban contexts is using human mobility data to study temporal heterogeneity in intercity travel networks.Hence,this paper explores China’s intercity travel patterns and their dynamics,with a comparison between weekdays and holidays,to contribute to our understanding of these phenomena.Using passenger travel data inferred from Tencent Location Big Data during weekdays(April 11-15,2016)and National Golden Week(October 1-7,2016),we compare the spatial patterns of Chinese intercity travel on weekdays and during Golden Week.The results show that the average daily intercity travel during Golden Week is significantly higher than that during weekdays,but the travel distance and degree of network clustering are significantly lower.This indicates temporal heterogeneity in mapping the intercity travel network.On weekdays,the three major cities of Beijing,Shanghai,and Guangzhou take prominent core positions,while cities that are tourism destinations or transportation hubs are more attractive during Golden Week.The reasons behind these findings can be explained by geographical proximity,administrative division(proximity of cultural and policy systems),travel distance,and travel purposes.展开更多
Background:This study examined the volume and patterns of physical activity(PA) and sedentary time(ST) across different segments of the week among boys and girls.Methods:A total of 188 children aged 7-12 years wore a ...Background:This study examined the volume and patterns of physical activity(PA) and sedentary time(ST) across different segments of the week among boys and girls.Methods:A total of 188 children aged 7-12 years wore a wrist-mounted ActiGraph GT3 X+accelerometer for 7 days.Time spent in PA and ST was calculated using ActiLife software.The mean number of minutes of light PA,moderate PA,vigorous PA,moderate-to-vigorous PA(MVPA),and ST were calculated per weekday(before school,during school,and after school) and per weekend day(morning and afternoon-evening).Results:After school represented the greatest accumulation of ST compared with before school and during school segments.Boys engaged in225.4 min/day of ST(95% confidence interval(CI):216-235),and girls engaged in 222.2 min/day of ST(95%CI:213-231).During school,boys engaged in significantly more MVPA than girls(46.1 min/day(95%CI:44-48) vs.40.7 min/day(95%CI:39-43)).Across the whole weekday,boys participated in significantly more MVPA than girls(103.9 min/day(95%CI:99-109) vs.95.7 min/day(95%CI:90-101)).The weekend afternoon—evening segment represented the larger accumulation of ST,where boys were significantly more sedentary than girls(367.5 min/day(95%CI:353-382) vs.339.8 min/day(95%CI:325-355),respectively).Conclusion:Our findings suggest that children are highly sedentary and spend little of their time in school in MVPA,especially girls.Routine breaks in school elicit increases in light PA and MVPA.Future work should consider the use of more active breaks within school time to encourage PA and reduce ST.展开更多
AIM:To evaluate the"weekend effect"on outcomes in patient admitted on the weekend for upper gastrointestinal bleeding(UGIB).METHODS:A comprehensive search was performed(March 2014).Studies comparing weekend ...AIM:To evaluate the"weekend effect"on outcomes in patient admitted on the weekend for upper gastrointestinal bleeding(UGIB).METHODS:A comprehensive search was performed(March 2014).Studies comparing weekend and weekday endoscopy in patients with UGIB were included.All studies had at least 2 of 3 primary outcomes which included:mortality,need for surgery,time to endoscopy,endoscopy on admission day,and length of hospital stay.Three authors individually extracted data.Metaanalysis was performed using pooled estimates with odds ratio or mean difference by fixed and random effects models.RESULTS:Eleven studies met the inclusion criteria.Patients admitted with UGIB on the weekend exhibited a statistically significant increase in mortality(OR=1.13;95%CI:1.06-1.20;P<0.01),need for surgery(OR=2.46;95%CI:1.51-3.99;P<0.01),and time to endoscopy(MD 2.68;95%CI:0.17-5.20;P=0.04)as compared to patients admitted with UGIB on a weekday.Furthermore,patients with UGIB admitted on weekend experienced statistically significant less endoscopy on day of admission(OR=0.72;95%CI:0.62-0.85;P<0.01).No difference was noted between the two groups for length of hospital stay(MD-1.29;95%CI:-3.03-0.45;P=0.15).CONCLUSION:A weekend effect seems to be apparent in patients with UGIB with significantly poorer outcomes.展开更多
基金National Natural Science Foundation of China,No.41501120,No.41722103The Fundamental Research Funds for the Central Universities,SNNU,No.18SZYB01China Postdoctoral Science Foundation,No.2020M670429。
文摘A largely unexplored application of“Big Data”in urban contexts is using human mobility data to study temporal heterogeneity in intercity travel networks.Hence,this paper explores China’s intercity travel patterns and their dynamics,with a comparison between weekdays and holidays,to contribute to our understanding of these phenomena.Using passenger travel data inferred from Tencent Location Big Data during weekdays(April 11-15,2016)and National Golden Week(October 1-7,2016),we compare the spatial patterns of Chinese intercity travel on weekdays and during Golden Week.The results show that the average daily intercity travel during Golden Week is significantly higher than that during weekdays,but the travel distance and degree of network clustering are significantly lower.This indicates temporal heterogeneity in mapping the intercity travel network.On weekdays,the three major cities of Beijing,Shanghai,and Guangzhou take prominent core positions,while cities that are tourism destinations or transportation hubs are more attractive during Golden Week.The reasons behind these findings can be explained by geographical proximity,administrative division(proximity of cultural and policy systems),travel distance,and travel purposes.
基金funded by University of the West of Scotland's VP Research Fund。
文摘Background:This study examined the volume and patterns of physical activity(PA) and sedentary time(ST) across different segments of the week among boys and girls.Methods:A total of 188 children aged 7-12 years wore a wrist-mounted ActiGraph GT3 X+accelerometer for 7 days.Time spent in PA and ST was calculated using ActiLife software.The mean number of minutes of light PA,moderate PA,vigorous PA,moderate-to-vigorous PA(MVPA),and ST were calculated per weekday(before school,during school,and after school) and per weekend day(morning and afternoon-evening).Results:After school represented the greatest accumulation of ST compared with before school and during school segments.Boys engaged in225.4 min/day of ST(95% confidence interval(CI):216-235),and girls engaged in 222.2 min/day of ST(95%CI:213-231).During school,boys engaged in significantly more MVPA than girls(46.1 min/day(95%CI:44-48) vs.40.7 min/day(95%CI:39-43)).Across the whole weekday,boys participated in significantly more MVPA than girls(103.9 min/day(95%CI:99-109) vs.95.7 min/day(95%CI:90-101)).The weekend afternoon—evening segment represented the larger accumulation of ST,where boys were significantly more sedentary than girls(367.5 min/day(95%CI:353-382) vs.339.8 min/day(95%CI:325-355),respectively).Conclusion:Our findings suggest that children are highly sedentary and spend little of their time in school in MVPA,especially girls.Routine breaks in school elicit increases in light PA and MVPA.Future work should consider the use of more active breaks within school time to encourage PA and reduce ST.
文摘AIM:To evaluate the"weekend effect"on outcomes in patient admitted on the weekend for upper gastrointestinal bleeding(UGIB).METHODS:A comprehensive search was performed(March 2014).Studies comparing weekend and weekday endoscopy in patients with UGIB were included.All studies had at least 2 of 3 primary outcomes which included:mortality,need for surgery,time to endoscopy,endoscopy on admission day,and length of hospital stay.Three authors individually extracted data.Metaanalysis was performed using pooled estimates with odds ratio or mean difference by fixed and random effects models.RESULTS:Eleven studies met the inclusion criteria.Patients admitted with UGIB on the weekend exhibited a statistically significant increase in mortality(OR=1.13;95%CI:1.06-1.20;P<0.01),need for surgery(OR=2.46;95%CI:1.51-3.99;P<0.01),and time to endoscopy(MD 2.68;95%CI:0.17-5.20;P=0.04)as compared to patients admitted with UGIB on a weekday.Furthermore,patients with UGIB admitted on weekend experienced statistically significant less endoscopy on day of admission(OR=0.72;95%CI:0.62-0.85;P<0.01).No difference was noted between the two groups for length of hospital stay(MD-1.29;95%CI:-3.03-0.45;P=0.15).CONCLUSION:A weekend effect seems to be apparent in patients with UGIB with significantly poorer outcomes.
