Sökning: "Sibship size"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Sibship size.

  1. 1. Effects of family configuration on cognitive functions and health across the adult life span

    Författare :Sara Holmgren; Bo Molander; Lars-Göran Nilsson; Annika Melinder; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Sibship size; birth order; intelligence; executive functioning; episodic memory; health; diseases; adulthood; old; Psychology; Psykologi;

    Sammanfattning : This thesis examines whether childhood family configuration influences performance on cognitive functions and health in adulthood and old age. All studies examined participants in the Betula Prospective Cohort Study aged 35 to 85 years (Nilsson et al., 1997). LÄS MER

  3. 2. Intelligence and models for cognitive development

    Författare :Linda Wänström; Daniel Thorburn; Gösta Hägglund; Dag Sörbom; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; intelligence; cognitive development; sample size; multilevel models; latent growth curve models; Statistics; Statistik; statistik; Statistics;

    Sammanfattning : This dissertation focuses on cognitive development. In papers I and II, I study a special model, the second order latent growth curve model, that can be used to study cognitive development. Algebraic expressions for the variance of the estimation of slope differences are given. LÄS MER

  4. 3. New evidence on germ-cell testicular cancer aetiology

    Författare :Lorenzo Richiardi; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Testicular neoplasm; Seminomas; Nonseminomas; Case-control study; Risk factors; Perinatal characteristics; Body size; Subfertility; Occurrence.;

    Sammanfattning : Testicular cancer has been increasing in incidence for at least 50 years in many populations, but its etiology remains elusive. We investigated several prenatal and postnatal factors in association with germ-cell testicular cancer risk. Moreover, we evaluated recent trends in testicular cancer incidence in Northern European countries. LÄS MER

  5. 4. Genetic structure and dispersal in plant populations

    Författare :Johan Fogelqvist; Martin Lascoux; Sophie Gerber; Beng-Olle Bengtsson; Uppsala universitet; []
    Nyckelord :population genetics; dispersal; structure; plant; gene flow;

    Sammanfattning : This thesis focuses on the spatial structure and methods to identify spatial structure in plants. Methods that investigate genetic structure can mainly be divided into equilibrium methods that reveal summed dispersal over many generations, and cluster methods, that reveal more recent dispersal events. LÄS MER

  7. 5. Opportunity for natural selection in Sweden : a study of childhood mortality and differential reproductivity

    Författare :Helen M. E. Hed; Marianne Rasmuson; Aldur Eriksson; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Opportunity for selection; Crow s index; Demography; Sweden; 1600-1980; Mortality; Fertility; genetik; Genetics;

    Sammanfattning : Opportunity for natural selection in human populations has so far mainly been studied on anthropological data for tribal populations or on census data for nations. The present study is mainly based on data on individual lifehistories but also, for part of the longitudinal study, on census data. LÄS MER