| 11. |
- Fridh, Maria, et al.
(författare)
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Associations between self-injury and involvement in cyberbullying among mentally distressed adolescents in Scania, Sweden
- 2019
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Ingår i: Scandinavian Journal of Public Health. - : SAGE Publications. - 1403-4948 .- 1651-1905. ; 47:2, s. 190-198
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Tidskriftsartikel (refereegranskat)abstract
- Aims: To investigate associations between self-injury and involvement in cyberbullying as a bully, victim or bully-victim among mentally distressed adolescents. Methods: Data from the public health survey of children and adolescents in Scania, Sweden 2016 were used. A questionnaire was answered anonymously in school by 9143 students in 9th grade compulsory school (response rate 77%) and 7949 students in 2nd grade of upper secondary school (response rate 73%). Students with past year (broadly defined) mental distress at least 2 weeks in a row (33% of boys and 63% of girls) were asked if they had performed self-injury (i.e. cut, superficially cut or otherwise injured themselves) past year, and those with data on self-injury and cyberbullying were included in the present study (n=6841). Associations between self-injury and cyberbullying were investigated by multiadjusted logistic regression analysis. Results: Among mentally distressed students, self-injury was reported by 11.7% of boys and 25.9% of girls. Age-adjusted analysis showed increasingly higher odds of self-injury among cyberbullies, cybervictims and cyberbully-victims, using non-involved as reference group (OR boys: 1.8, 2.3, 3.0; girls: 2.1, 3.2, 4.8). Associations weakened after adjustment for several potential confounders but remained significant for all cyberbullying groups except male cyberbullies, among whom significance was lost after adjustment for smoking, alcohol and narcotics. Conclusions: Peer victimization in cyber space is associated with self-injury, especially among victims and bully-victims. Decreasing peer victimization is a priority, and school and health professionals need to be aware of the associations between cyberbullying and self-injury among mentally distressed adolescents.
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| 12. |
- Fridh, Maria, et al.
(författare)
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Subjective health complaints and exposure to peer victimization among disabled and non-disabled adolescents: A population-based study in Sweden.
- 2018
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Ingår i: Scandinavian journal of public health. - : SAGE Publications. - 1651-1905 .- 1403-4948. ; 46:2
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Tidskriftsartikel (refereegranskat)abstract
- To investigate subjective health complaints (SHCs) (psychological and somatic, respectively) among disabled and non-disabled adolescents, focusing on the impact of traditional bullying and cyber harassment, and furthermore to report psychological and somatic SHCs across different types of disability.Data from the public health survey of children and adolescents in Scania, Sweden, 2012 was used. A questionnaire was answered anonymously in school by 9791 students in the 9th grade (response rate 83%), and 7533 of these with valid answers on key questions were included in this study. Associations with daily SHCs were investigated by multi-adjusted logistic regression analyses.Any disability was reported by 24.1% of boys and 22.0% of girls. Disabled students were more exposed to cyber harassment (boys: 20.0%; girls: 28.2%) than non-disabled peers (boys: 11.8%; girls: 18.1%). Exposure to traditional bullying showed the same pattern but with a lower prevalence. Disabled students had around doubled odds of both daily psychological SHCs and daily somatic SHCs in the fully adjusted models. In general, the odds increased with exposure to cyber harassment or traditional bullying and the highest odds were seen among disabled students exposed to both cyber harassment and traditional bullying. Students with ADHD/ADD had the highest odds of daily psychological SHCs as well as exposure to traditional bullying across six disability types.Disabled adolescents report poorer health and are more exposed to both traditional bullying and cyber harassment. This public health issue needs more attention in schools and in society in general.
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| 13. |
- Fridh, Maria, et al.
(författare)
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Subjective health complaints in adolescent victims of cyber harassment: moderation through support from parents/friends - a Swedish population-based study.
- 2015
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Ingår i: BMC Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Victimization in cyberspace has emerged as a new public health issue among the young. The main purpose of this study was to analyze associations between cyber victimization defined as cyber harassment (CH) (a somewhat broader concept than cyberbullying) and subjective health complaints (SHC), to study whether these associations were modified by parental/friend support (measured as communication), and to explore the influence of traditional bullying victimization (TBV) on the association between CH and SHC.
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| 14. |
- Hansen, Kristina, et al.
(författare)
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Age at smoking initiation and self-rated health among second grade high school boys and girls in Scania, Sweden, a cross-sectional study.
- 2015
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Ingår i: BMC Public Health. - : Springer Science and Business Media LLC. - 1471-2458. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Smoking is usually initiated early in life and most adult regular smokers have started smoking before 18 years of age. A younger age at smoking initiation is associated with risk taking behaviours and worse health outcomes regarding psychological and somatic conditions, suggested to be caused by exposure during critical developmental periods. The present study aims to investigate self-rated health among second grade high school boys and girls related to age at smoking initiation (<14 years of age and ≥ 14 years of age) among current and former smokers, compared to never smokers.
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| 15. |
- Hotchkiss, E. R., et al.
(författare)
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Sources of and processes controlling CO2 emissions change with the size of streams and rivers
- 2015
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Ingår i: Nature Geoscience. - 1752-0894 .- 1752-0908. ; 8:9, s. 696-699
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Tidskriftsartikel (refereegranskat)abstract
- Carbon dioxide (CO2) evasion from streams and rivers to the atmosphere represents a substantial flux in the global carbon cycle(1-3). The proportions of CO2 emitted from streams and rivers that come from terrestrially derived CO2 or from CO2 produced within freshwater ecosystems through aquatic metabolism are not well quantified. Here we estimated CO2 emissions from running waters in the contiguous United States, based on freshwater chemical and physical characteristics and modelled gas transfer velocities at 1463 United States Geological Survey monitoring sites. We then assessed CO2 production from aquatic metabolism, compiled from previously published measurements of net ecosystem production from 187 streams and rivers across the contiguous United States. We find that CO2 produced by aquatic metabolism contributes about 28% of CO2 evasion from streams and rivers with flows between 0.0001 and 19,000 m(3) s(-1). We mathematically modelled CO2 flux from groundwater into running waters along a stream-river continuum to evaluate the relationship between stream size and CO2 source. Terrestrially derived CO2 dominates emissions from small streams, and the percentage of CO2 emissions from aquatic metabolism increases with stream size. We suggest that the relative role of rivers as conduits for terrestrial CO2 efflux and as reactors mineralizing terrestrial organic carbon is a function of their size and connectivity with landscapes.
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| 16. |
- Karimi, Fariba, 1981-, et al.
(författare)
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Mapping bilateral information interests using the activity of Wikipedia editors
- 2015
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Ingår i: Palgrave communications. - : Springer Science and Business Media LLC. - 2055-1045. ; 1, s. 1-7
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Tidskriftsartikel (refereegranskat)abstract
- We live in a global village where electronic communication has eliminated the geographical barriers of information exchange. The road is now open to worldwide convergence of information interests, shared values and understanding. Nevertheless, interests still vary between countries around the world. This raises important questions about what today’s world map of information interests actually looks like and what factors cause the barriers of information exchange between countries. To quantitatively construct a world map of information interests, we devise a scalable statistical model that identifies countries with similar information interests and measures the countries’ bilateral similarities. From the similarities we connect countries in a global network and find that countries can be mapped into 18 clusters with similar information interests. Through regression we find that language and religion best explain the strength of the bilateral ties and formation of clusters. Our findings provide a quantitative basis for further studies to better understand the complex interplay between shared interests and conflict on a global scale. The methodology can also be extended to track changes over time and capture important trends in global information exchange.
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| 17. |
- Kawamoto, Tatsuro, et al.
(författare)
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Estimating the resolution limit of the map equation in community detection
- 2015
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Ingår i: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics. - 1539-3755 .- 1550-2376. ; 91:1, s. 012809-
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Tidskriftsartikel (refereegranskat)abstract
- A community detection algorithm is considered to have a resolution limit if the scale of the smallest modules that can be resolved depends on the size of the analyzed subnetwork. The resolution limit is known to prevent some community detection algorithms from accurately identifying the modular structure of a network. In fact, any global objective function for measuring the quality of a two-level assignment of nodes into modules must have some sort of resolution limit or an external resolution parameter. However, it is yet unknown how the resolution limit affects the so-called map equation, which is known to be an efficient objective function for community detection. We derive an analytical estimate and conclude that the resolution limit of the map equation is set by the total number of links between modules instead of the total number of links in the full network as for modularity. This mechanism makes the resolution limit much less restrictive for the map equation than for modularity; in practice, it is orders of magnitudes smaller. Furthermore, we argue that the effect of the resolution limit often results from shoehorning multilevel modular structures into two-level descriptions. As we show, the hierarchical map equation effectively eliminates the resolution limit for networks with nested multilevel modular structures.
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| 18. |
- Kheirkhahzadeh, Masoumeh, et al.
(författare)
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Efficient community detection of network flows for varying Markov times and bipartite networks
- 2016
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Ingår i: Physical Review E. - 2470-0045. ; 93:3
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Tidskriftsartikel (refereegranskat)abstract
- Community detection of network flows conventionally assumes one-step dynamics on the links. For sparse networks and interest in large-scale structures, longer timescales may be more appropriate. Oppositely, for large networks and interest in small-scale structures, shorter timescales may be better. However, current methods for analyzing networks at different timescales require expensive and often infeasible network reconstructions. To overcome this problem, we introduce a method that takes advantage of the inner workings of the map equation and evades the reconstruction step. This makes it possible to efficiently analyze large networks at different Markov times with no extra overhead cost. The method also evades the costly unipartite projection for identifying flow modules in bipartite networks.
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| 19. |
- Lambiotte, Renaud, et al.
(författare)
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Effect of memory on the dynamics of random walks on networks
- 2015
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Ingår i: Journal of Complex Networks. - : Oxford University Press. - 2051-1310 .- 2051-1329. ; 3:2, s. 177-188
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Tidskriftsartikel (refereegranskat)abstract
- Pathways of diffusion observed in real-world systems often require stochastic processes going beyond first-order Markov models, as implicitly assumed in network theory. In this work, we focus on second-order Markov models, and derive an analytical expression for the effect of memory on the spectral gap and thus, equivalently, on the characteristic time needed for the stochastic process to asymptotically reach equilibrium. Perturbation analysis shows that standard first-order Markov models can either overestimate or underestimate the diffusion rate of flows across the modular structure of a system captured by a second-order Markov network. We test the theoretical predictions on a toy example and on numerical data, and discuss their implications for network theory, in particular in the case of temporal or multiplex networks.
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| 20. |
- Lambiotte, Renaud, et al.
(författare)
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From networks to optimal higher-order models of complex systems
- 2019
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Ingår i: Nature Physics. - : NATURE PUBLISHING GROUP. - 1745-2473 .- 1745-2481. ; 15:4, s. 313-320
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Tidskriftsartikel (refereegranskat)abstract
- Rich data are revealing that complex dependencies between the nodes of a network may not be captured by models based on pairwise interactions. Higher-order network models go beyond these limitations, offering new perspectives for understanding complex systems.
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