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Contagious Interactions: Essays on social and epidemiological networks
Stockholm University, Faculty of Social Sciences, Department of Sociology.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation has two overall aims; to explore and develop the use of SNA in sociology, and to demonstrate that sociology has much to give to other sciences. Interdisciplinary collaboration is necessary because we do not live in a world in which subject areas are strictly isolated. Human beings are social animals, and a sociological understanding is crucial in all human-related science. The examination in this thesis of different kinds of social networks and how they affect the lives of individuals (and vice versa) will provide knowledge both in the development of methods for analyzing social networks, and in their areas specific scientific areas.

Paper I-III investigates sexual networks and how the number of sexual encounters involving intercourse in combination with the number of sexual partners affects the dynamics of sexually transmitted infections (STIs). The results show that this relationship is non-linear, indicating that it may not be the individuals with the largest number of partners who have the most impact on the spread of STIs. One might also have to focus interventions on individuals who have a large number of sexual encounters involving intercourse per partner, and who have several (but not necessarily a very large number of) partners.

In the fourth paper, we apply the theoretical concept of so-called small worlds to a sexual network. The spread of epidemics can be difficult to stop in such networks, and we show that the sexual network of individuals infected with chlamydia can be characterized as such.

The fifth and last paper differs from the four first. In this paper, we focus on how individuals who committed suicide in Stockholm during the 1990s where connected to each other. The social-interaction exposure effect is larger for the individual within the family than at the workplace; yet work-domain exposure is more important for the overall suicide rate because individuals are more often exposed to suicides of co-workers than family members.

Place, publisher, year, edition, pages
Stockholm: Acta Universitatis Stockholmiensis, 2008. , 201 p.
Series
Stockholm studies in sociology, ISSN 0491-0885 ; N.S., 33
Keyword [en]
Social networks, social network analysis (SNA), network epidemiology, sexually transmitted infections (STI), mathematical modeling, suicide, diffusion.
National Category
Sociology
Research subject
Sociology
Identifiers
URN: urn:nbn:se:su:diva-8309ISBN: 978-91-86071-06-6 (print)OAI: oai:DiVA.org:su-8309DiVA: diva2:200057
Public defence
2008-12-12, hörsal 5, hus B, Universitetsvägen 10, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2008-11-20 Created: 2008-11-20 Last updated: 2017-05-19Bibliographically approved
List of papers
1. Number of sexual encounters involving intercourse and the transmission of sexually transmitted infections
Open this publication in new window or tab >>Number of sexual encounters involving intercourse and the transmission of sexually transmitted infections
2006 In: Sexually Transmitted Diseases, ISSN 0148-5717, Vol. 33, no 6, 342-349 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25612 (URN)
Note
Part of urn:nbn:se:su:diva-8309Available from: 2008-11-20 Created: 2008-11-20Bibliographically approved
2. Modeling sexually transmitted infections:: The effect of partnership activity and number of partners on R0
Open this publication in new window or tab >>Modeling sexually transmitted infections:: The effect of partnership activity and number of partners on R0
2007 In: Theoretical Population Biology, ISSN 0040-5809, Vol. 72, no 3, 389-399 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25613 (URN)000250679800006 ()
Note
Part of urn:nbn:se:su:diva-8309Available from: 2008-11-20 Created: 2008-11-20Bibliographically approved
3. Empirical evidence of a non-linear relationship between the number of sexual partners and the percentage with secondary infections
Open this publication in new window or tab >>Empirical evidence of a non-linear relationship between the number of sexual partners and the percentage with secondary infections
(English)Manuscript (preprint) (Other academic)
National Category
Sociology
Identifiers
urn:nbn:se:su:diva-25614 (URN)
Note

Part of urn:nbn:se:su:diva-8309

Available from: 2008-11-20 Created: 2008-11-20 Last updated: 2013-07-08Bibliographically approved
4. Spatial bridges and the spread of chlamydia:: The case of a county in Sweden
Open this publication in new window or tab >>Spatial bridges and the spread of chlamydia:: The case of a county in Sweden
2007 In: Sexually Transmitted Diseases, ISSN 0148-5717, Vol. 34, no 1, 47-53 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-25615 (URN)
Note
Part of urn:nbn:se:su:diva-8309Available from: 2008-11-20 Created: 2008-11-20Bibliographically approved
5. Interaction domains and suicides: A population-based panel study of suicides in the Stockholm metropolitan area, 1991-1999
Open this publication in new window or tab >>Interaction domains and suicides: A population-based panel study of suicides in the Stockholm metropolitan area, 1991-1999
2008 (English)In: Social Forces, ISSN 0037-7732, E-ISSN 1534-7605, Vol. 87, no 2, 713-740 p.Article in journal (Refereed) Published
Abstract [en]

This article examines how suicides influence suicide risks of others within two interaction domains: the family and the workplace. A distinction is made between dyad-based social-interaction effects and degree-based exposure effects. A unique database including all individuals who ever lived in Stockholm during the 1990s is analyzed. For about 5.6 years on average, 1.2 million individuals are observed, and 1,116 of them commit suicide. Controlling for other risk factors, men exposed to a suicide in the family (at work) are 8.3 (3.5) times more likely to commit suicide than non-exposed men. The social-interaction effect thus is larger within the family domain; yet work-domain exposure is more important for the suicide rate because individuals are more often exposed to suicides of coworkers than family members.

Identifiers
urn:nbn:se:su:diva-25616 (URN)10.1353/sof.0.0130 (DOI)000262344400004 ()
Note
Part of urn:nbn:se:su:diva-8309Available from: 2008-11-20 Created: 2008-11-20 Last updated: 2017-12-13Bibliographically approved

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