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| 2. |
- Cantor-Graae, Elizabeth, et al.
(författare)
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Risk of schizophrenia in second-generation immigrants: a Danish population-based cohort study.
- 2007
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Ingår i: Psychological Medicine. - 1469-8978. ; 37:4, s. 485-494
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Tidskriftsartikel (refereegranskat)abstract
- Background. Urban birth, a risk factor for schizophrenia, is more frequent among secondgeneration immigrants. The aim of the current study was to determine whether the increased risk for schizophrenia found in second-generation immigrants is explained by the degree of urbanization of birthplace and/or factors related to parentage, such as geographic origin or history of residence abroad during upbringing. Method. Using data from the Danish Civil Registration System (CRS), we established a population-based cohort of 2.0 million Danes (persons born in Denmark). Schizophrenia in cohort members was identified by cross-linkage with the Danish Psychiatric Central Register. Results. The relative risk of developing schizophrenia was 1.93 [95% confidence interval (CI) 1.79–2.08] and 2.96 (95% CI 2.49–3.51) among persons with one or both parents foreign-born respectively compared to native Danes. Adjustment for urbanization of birthplace and parental characteristics reduced these risks slightly. However, urbanization had a lesser effect in secondgeneration immigrants than in Danes. History of residence abroad was a risk factor for schizophrenia, regardless of whether parents were foreign-born or native Danes. Conclusion. The increased risk found in second-generation immigrants cannot be explained by urbanization or parental characteristics pertaining to age, mental illness, geographic origin or residence abroad during a child’s upbringing.
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| 3. |
- Cardeña, Etzel
(författare)
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Review of 9/11: Mental Health in the Wake of Terrorist Attacks. Edited by Y. Neria, R. Gross, R. Marshall, & E. Susser.
- 2007
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Ingår i: Psychological Medicine. - 1469-8978. ; 37:10, s. 1511-1512
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Recension (övrigt vetenskapligt/konstnärligt)abstract
- Reviews the book, 9/11: Mental Health in the Wake of Terrorist Attacks edited by Y. Neria, R. Gross, R. Marshall with E. Susser (Guest editor) (see record 2006-21181-000). This voluminous book may parallel, to an extent, the response by the mental health community to the 9/11 terrorist attacks: some parts of it are excellent, others not so, and there is a great amount of redundancy, self-congratulation, and political maneuvering. Perhaps because it contains dissociative symptoms as diagnostic criteria, the book has almost no references to acute stress disorder (ASD) as a post-traumatic DSM-IV diagnosis, a point made by Shalev. The ASD diagnosis has been criticized by one of the editors, but inclusion of this DSM-IV diagnosis would have been essential in a book with an aim to educate mental health professionals on human reactions to disaster and post-traumatic diagnoses.
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| 4. |
- Evengård, Birgitta, 1952-, et al.
(författare)
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The epidemiology of chronic fatigue in the Swedish Twin Registry
- 2005
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Ingår i: Psychological Medicine. - 0033-2917 .- 1469-8978. ; 35:9, s. 1317-1326
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Tidskriftsartikel (refereegranskat)abstract
- CFS-like illness may be more common that previously acknowledged. There is a marked increase in risk by gender. Previous reports that CFS is more prevalent in individuals in certain occupational categories were not confirmed and may have been due to confounding by gender.
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| 6. |
- Jablonska, B, et al.
(författare)
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Ethnicity, socio-economic status and self-harm in Swedish youth : a national cohort study.
- 2009
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Ingår i: Psychological Medicine. - 0033-2917 .- 1469-8978. ; 39:1, s. 87-94
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Previous studies have shown an elevated risk for self-harm in adolescents from ethnic minorities. However, potential contributions to this risk from socio-economic factors have rarely been addressed. The main aim of this article was to investigate any such effects. METHOD: A national cohort of 1009 157 children born during 1973-1982 was followed prospectively from 1991 to 2002 in Swedish national registers. Multivariate Cox analyses of proportional hazards were used to estimate the relative risk of hospital admission for self-harm. Parental country/region of birth was used as proxy for ethnicity. RESULTS: Youth with two parents born outside Sweden (except those from Southern Europe) had higher age- and gender-adjusted hazard ratios (HRs) of self-harm than the majority population (HR 1.6-2.3). The HRs decreased for all immigrant groups when socio-economic factors were accounted for but remained significantly higher for immigrants from Finland and Western countries and for youth with one Swedish-born and one foreign-born parent. CONCLUSIONS: Socio-economic factors explain much of the variation by parental country of birth of hospital admissions for self-harm in youth in Sweden.
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| 7. |
- Kato, K, et al.
(författare)
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A population-based twin study of functional somatic syndromes
- 2009
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Ingår i: Psychological Medicine. - : Cambridge University Press. - 0033-2917 .- 1469-8978. ; 39:3, s. 497-505
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The mechanisms underlying the co-occurrence of the functional somatic syndromes are largely unknown. No empirical study has explicitly examined how genetic and environmental factors influence the co-morbidity of these syndromes. We aimed to examine how the co-morbidity of functional somatic syndromes is influenced by genetic and environmental factors that are in common to the syndromes. METHOD: A total of 31318 twins in the Swedish Twin Registry aged 41-64 years underwent screening interviews via a computer-assisted telephone system from 1998 to 2002. Four functional somatic syndromes (chronic widespread pain, chronic fatigue, irritable bowel syndrome, and recurrent headache) and two psychiatric disorders (major depression and generalized anxiety disorder) were assessed using structured questions based on standard criteria for each illness in a blinded manner. RESULTS: Multivariate twin analyses revealed that a common pathway model with two latent traits that were shared by the six illnesses fit best to the women's data. One of the two latent traits loaded heavily on the psychiatric disorders, whereas the other trait loaded on all four of the functional somatic syndromes, particularly chronic widespread pain, but not on the psychiatric disorders. All illnesses except the psychiatric disorders were also affected by genetic influences that were specific to each. CONCLUSIONS: The co-occurrence of functional somatic syndromes in women can be best explained by affective and sensory components in common to all these syndromes, as well as by unique influences specific to each of them. The findings clearly suggest a complex view of the multifactorial pathogenesis of these illnesses.
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| 8. |
- Kendler, K. S., et al.
(författare)
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The development of fears from early adolesence to young adulthood : a multivariate study
- 2008
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Ingår i: Psychological Medicine. - 0033-2917 .- 1469-8978. ; 38:12, s. 1759-1769
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Tidskriftsartikel (refereegranskat)abstract
- Background. Common fears change over development. Genetic and environmental risk factors for fears are partly shared across fears and partly fear-specific. The nature of the changes in common and fear-specific genetic and environmental risk factors over time is unknown.Method. Self-reported fears were obtained at ages 13-14, 16-17 and 19-20 from 2404 twins in the Swedish Twin Study of Child and Adolescent Development. A multivariate longitudinal twin analysis was conducted with Mx.Results. Eighteen individual items formed four fear factors: animal, blood-injury, situational, and social. The best-fit model had no quantitative or qualitative sex effects or shared environmental effects, but included a strong common factor with a stable cross-time Structure with highest loadings on situational and lowest loadings on social fears. New common and fear-specific genetic risk factors emerged over development. With increasing age, genetic effects declined in overall importance and became more fear-specific. Cross-time continuity in specific genetic effects was highest for animal and lowest for social fears. Social fears had a 'burst' of specific genetic effects in late adolescence. Individual-specific environmental factors impacted both on the general fear factor and on specific fears. Compared to genetic effects, the impact of the unique environment was more time-specific.Conclusions. Genetic and environmental risk factors for individual fears are partly mediated through a common fear factor and are partly fear-specific in their effect. The developmental pattern of these risk factors is complex and dynamic with new common and specific genetic effects arising in late adolescence and early adulthood.
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| 9. |
- Kramer, Mark, 1973-, et al.
(författare)
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The role of internalizing and externalizing liability factors in accounting for gender differences in the prevalence of common psychopathological syndromes
- 2008
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Ingår i: Psychological Medicine. - : Cambridge University Press. - 0033-2917 .- 1469-8978. ; 38:1, s. 51-62
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Tidskriftsartikel (refereegranskat)abstract
- Background: We hypothesized that gender differences in average levels on the internalizing and externalizing factors that account for co-morbidity among common psychopathological syndromes in both men and women account for gender differences in the prevalence of specific syndromes.Method: The latent structure of 11 syndromes was examined in a middle-aged (mean age=52.66 years, S.D.=5.82) sample of 2992 (37% men) members of the community-based Minnesota Twin Registry (MTR) assessed using 10 scales of the Psychiatric Diagnostic Screening Questionnaire (PDSQ) and an adult antisocial behavior scale. Confirmatory factorial invariance models were applied to a best-fitting, internalizing-externalizing model.Results: A 'strong gender invariance model' fit best, indicating that gender differences in the means of individual syndromes were well accounted for by gender differences in mean levels of internalizing and externalizing. Women exhibited higher mean levels of internalizing (d=0.23) and lower mean levels of externalizing (d=-0.52) than men.Conclusions: These findings suggest that risk factors for common mental disorders exhibiting gender differences may influence prevalence at the latent factor level. Future research may benefit from focusing on both the latent factor and individual syndrome levels in explaining gender differences in psychopathology.
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| 10. |
- Larsson, Henrik, et al.
(författare)
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A common genetic factor explains the association between psychopathic personality and antisocial behavior
- 2007
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Ingår i: Psychological Medicine. - 0033-2917 .- 1469-8978. ; 37:1, s. 15-26
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Tidskriftsartikel (refereegranskat)abstract
- Background: Both psychopathic personality traits and antisocial behavior are influenced by geneticas well as environmental factors. However, little is known about how genetic and environmental factors contribute to the associations between the psychopathic personality traits and antisocial behavior.Method: Data were drawn from a longitudinal population-based twin sample including all 1480 twin pairs born in Sweden between May 1985 and December 1986. The twins responded to mailed self-report questionnaires at two occasions: 1999 (twins 13–14 years old), and 2002 (twins 16–17years old).Results: A common genetic factor loaded substantially on both psychopathic personality traits and antisocial behavior, whereas a common shared environmental factor loaded exclusively on antisocial behavior.Conclusions: The genetic overlap between psychopathic personality traits and antisocial behavior may reflect a genetic vulnerability to externalizing psychopathology. The finding of shared environmental influences only in antisocial behavior suggests an etiological distinction between psychopathic personality dimensions and antisocial behavior. Knowledge about temperamental correlates to antisocial behavior is important for identification of susceptibility genes, as well as for possible prevention through identification of at-risk children early in life
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