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Sökning: WFRF:(Hopper John L) > Samhällsvetenskap

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1.
  • Silventoinen, Karri, et al. (författare)
  • Education in twins and their parents across birth cohorts over 100 years : an individual-level pooled analysis of 42 twin cohorts
  • 2017
  • Ingår i: Twin Research and Human Genetics. - Stockholm : Karolinska Institutet, Dept of Medical Epidemiology and Biostatistics. - 1832-4274 .- 1839-2628.
  • Tidskriftsartikel (refereegranskat)abstract
    • Whether monozygotic (MZ) and dizygotic (DZ) twins differ from each other in a variety of phenotypes is important for genetic twin modeling and for inferences made from twin studies in general. We analyzed whether there were differences in individual, maternal and paternal education between MZ and DZ twins in a large pooled dataset. Information was gathered on individual education for 218,362 adult twins from 27 twin cohorts (53% females; 39% MZ twins), and on maternal and paternal education for 147,315 and 143,056 twins respectively, from 28 twin cohorts (52% females; 38% MZ twins). Together, we had information on individual or parental education from 42 twin cohorts representing 19 countries. The original education classifications were transformed to education years and analyzed using linear regression models. Overall, MZ males had 0.26 (95% CI [0.21, 0.31]) years and MZ females 0.17 (95% CI [0.12, 0.21]) years longer education than DZ twins. The zygosity difference became smaller in more recent birth cohorts for both males and females. Parental education was somewhat longer for fathers of DZ twins in cohorts born in 1990-1999 (0.16 years, 95% CI [0.08, 0.25]) and 2000 or later (0.11 years, 95% CI [0.00, 0.22]), compared with fathers of MZ twins. The results show that the years of both individual and parental education are largely similar in MZ and DZ twins. We suggest that the socio-economic differences between MZ and DZ twins are so small that inferences based upon genetic modeling of twin data are not affected.
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2.
  • Jayasekara, Harindra, et al. (författare)
  • Alcohol consumption for different periods in life, intake pattern over time and all-cause mortality
  • 2015
  • Ingår i: Journal of Public Health. - : Oxford University Press (OUP). - 1741-3842 .- 1741-3850. ; 37:4, s. 625-633
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Conventionally, cohort studies have assessed the association between alcohol and all-cause mortality by using alcohol intake at enrolment.Methods: In theMelbourne Collaborative Cohort Study, participants were asked about usual frequency and quantity of beverage-specific alcoholintake for 10-year periods starting at age 20 from which current, past and lifetime intakes were calculated.We used Cox regression to estimate hazardratios for mortality for 39 577 participants of theMelbourne Collaborative Cohort Study aged 40–69 at baseline.Results: After a mean follow-up of 15 years/person, we identified 4639 deaths. Associations between all-cause mortality and lifetime, current(baseline) and past intakewere J shaped, with lower mortality at low intake (e.g. ,40 g/day for men and 10 g/day for women using lifetime intake)and elevated mortality at higher intake. Formen, consistent light-to-moderate drinking (.0–39/.0–39 g/day) from age 20 to baseline agewasassociated with a 16% lower mortality, while heavy drinking at both ages (80/40 and 40/0 g/day) was associated with higher mortality comparedwith stable abstinence.Conclusions: Our findings support a reduced mortality risk associated with low-dose drinking but also highlight a higher mortality risk for consistentheavy drinking from a young age.
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