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| 2. |
- Johansson, Boo, et al.
(författare)
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Change in cognitive cababilities in the old-old: The effects of proximity to death in genetically-related individuals over a six-year period.
- 2004
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Ingår i: Psych Aging. - : American Psychological Association (APA). ; :19, s. 145-156
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Tidskriftsartikel (refereegranskat)abstract
- Change in cognitive abilities was assessed over a 6-year period in a sample of monozygotic and same-sex dizygotic twin pairs (N = 507 individuals), aged 80 and older (mean age = 83.3 years: SD = 3.1). who remained nondemented over the course of the study. Latent growth models (LGMs) show that chronological age and time to death are consistent predictors of decline in measures of memory, reasoning, speed, and verbal abilities. Multivariate LGM analysis resulted in weak and often negative correlations among rates of change between individuals within twin pairs, indicating greater differential change within twin pairs than occurs on average across twin pairs. These findings highlight several challenges for estimating genetic sources of variance in the context of compromised health and mortality-related change
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| 3. |
- Johansson, C, et al.
(författare)
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Genetics of affective disorders
- 2001
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Ingår i: European neuropsychopharmacology : the journal of the European College of Neuropsychopharmacology. - 0924-977X. ; 11:6, s. 385-394
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Tidskriftsartikel (refereegranskat)
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| 4. |
- Svedberg, P, et al.
(författare)
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Extra-intestinal manifestations associated with irritable bowel syndrome : a twin study
- 2002
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Ingår i: Alimentary Pharmacology and Therapeutics. - : Wiley. - 0269-2813 .- 1365-2036. ; 16:5, s. 975-983
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Little is known about the role of genetic and environmental factors in irritable bowel syndrome. Various extra-intestinal manifestations are more prevalent in cases than in controls. Genetic effects may be important in the liability to develop functional bowel disorders. AIMS: To evaluate the associations of irritable bowel syndrome with several disorders co-morbid with the condition, using both a case-control design and a co-twin control design. METHODS: A sample of 850 Swedish twin pairs, aged 18-85 years, was contacted for a telephone interview. Through a diagnostic algorithm, 72 unrelated cases of irritable bowel syndrome and 216 age- and gender-matched controls were identified. Fifty-eight twin pairs discordant for irritable bowel syndrome were evaluated in co-twin analyses. RESULTS: Renal problems (odds ratio (OR)=3.3; confidence interval (CI), 1.3-8.2), obesity (OR=2.6; CI, 1.0-6.4), underweight in the past (OR=2.4; CI, 1.1-6.4), gluten intolerance (OR=9.0; CI, 1.4-60.1), rheumatoid arthritis (OR=3.2; CI, 1.1-9.4) and poor self-rated health (OR=1.8; CI, 1.0-3.2) were significantly associated with irritable bowel syndrome. In the co-twin analyses, the only factors maintaining significance were renal and recurrent urinary tract problems. CONCLUSIONS: The association between irritable bowel syndrome and renal and urinary tract problems does not reflect a genetic or familial mediation. Eating disorders in childhood represent a familial-environmental influence on irritable bowel syndrome, whereas the association with rheumatoid arthritis and perhaps gluten intolerance probably reflects genetic mediation.
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