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Major initiatives attempt to prevent dementia by targeting modifiable risk factors. Low education is frequently pointed to, due to its relationship with dementia. Impact of education is difficult to assess, however, because of associations with multiple other factors, requiring large population-representative samples to tease the relationships apart. We studied 207,814 Norwegian men born between 1950 and 1959 who underwent compulsory cognitive testing during military conscription as young adults, to systematically test associations of education, cognition, and other important factors. Participants were grouped into five education levels and seven cognitive levels. A total of 1,521 were diagnosed with dementia between ages 60 and 69 y. While having compulsory education only was associated with increased risk (Hazard ratio [HR] = 1.37, CI: 1.17 to 1.60), this association was markedly attenuated when controlling for cognitive test scores (HR = 1.08, CI: 0.91 to 1.28). In contrast, low cognitive score was associated with double risk of later diagnosis, even when controlling for education (HR = 2.00, CI: 1.65 to 2.42). This relationship survived controlling for early-life socioeconomic status and replicated within pairs of brothers. This suggests that genetic and environmental factors shared within families, e.g., common genetics, parental education, socioeconomic status, or other shared experiences, cannot account for the association. Rather, independent, nonfamilial factors are more important. In contrast, within-family factors accounted for the relationship between low education and diagnosis risk. In conclusion, implementing measures to increase cognitive function in childhood and adolescence appears to be a more promising strategy for reducing dementia burden. [ABSTRACT FROM AUTHOR]

Some countries have certifying institutions for competence acquired at the workplace. These institutions provide incentives for workplace training that may have favourable effects on productivity, earnings and labour market participation. We present evidence on the earnings effects of attaining vocational qualifications in adulthood through two alternative routes: (1) apprenticeship and (2) recognition and testing of vocational competence acquired through relevant work experience. Drawing on longitudinal administrative data from Norway and tracking the labour market careers of individuals without completed upper secondary education by age 25, we estimate the impacts of acquiring vocational qualifications on future labour earnings. To allow for differential labour market trajectories of those who do and do not acquire qualifications, we account for unobserved individual heterogeneity in both levels and earnings growth. Without a rich representation of unobserved heterogeneity, estimated earnings effects are exaggerated. We find that vocational qualifications from both the apprenticeship and the experience-based routes boost earnings of men and women. Certification of already acquired skills has some value in itself, but adult apprenticeships have more positive effects on future earnings, as they involve greater individual skills development.

Objectives: Earlier studies suggest that being married in later life protects against dementia, and that being single in old age increases the risk of dementia. In this study, we examine midlife marital status trajectories and their association with dementia and mild cognitive impairment (MCI) at ages 70 plus using a large population based sample from Norway. Methods: Based on a general population sample linked to population registries (N = 8706), we used multinomial logistic regression to examine the associations between six types of marital trajectories (unmarried, continuously divorced, intermittently divorced, widowed, continuously married, intermittently married) between age 44 and 68 years from national registries and a clinical dementia or a MCI diagnosis after age 70. We estimated relative risk ratios (RRR) and used mediation analyses adjusting for education, number of children, smoking, hypertension, obesity, physical inactivity, diabetes, mental distress, and having no close friends in midlife. Inverse probability weighting and multiple imputations were applied. The population attributable fraction was estimated to assess the potential reduction in dementia cases due to marital histories. Results: Overall, 11.6% of the participants were diagnosed with dementia and 35.3% with MCI. Dementia prevalence was lowest among the continuously married (11.2%). Adjusting for confounders, the risk of dementia was higher for the unmarried (RRR = 1.73; 95% CI: 1.24, 2.40), continuously divorced (RRR = 1.66; 95% CI: 1.14, 2.43), and intermittently divorced (RRR = 1.50; 95% CI: 1.09, 2.06) compared to the continuously married. In general, marital trajectory was less associated with MCI than with dementia. In the counterfactual scenario, where all participants had the same risk of receiving a dementia diagnosis as the continuously married group, there would be 6.0% fewer dementia cases. Discussion: Our data confirm that staying married in midlife is associated with a lower risk of dementia and that divorced people account for a substantial share of dementia cases. [ABSTRACT FROM AUTHOR]

The national Norwegian school reform of 1994, which gave students statutory rights to at least 3 years of upper secondary education, had a significant impact on educational attainment among immigrant youth. In particular, we find that the immigrant transition rate from compulsory schooling to completion of the first year of upper secondary education improved significantly from the pre- to the post-reform period. We present evidence suggesting that this improvement can be attributed to a reduction in school capacity constraints rather than to cohort heterogeneity. An important implication is that nontargeted educational reforms can have large effects on the educational attainment of disadvantaged groups in general and ethnic minority youth in particular. (Contains 13 tables.)

We study assortative mating of Norwegian parents over five decades and its consequences for offspring outcomes. Parents are characterised by the earnings decile of their parents (the offspring's grandparents) as an indicator of social class. While assortative mating has remained stable across decades, parenthood has become more skewed toward the higher classes. Examining the influence on offspring education and employment, we find that the marginal effect of one parent's class is smaller the higher is the class of the other. Overall, mating trends have contributed to slight improvements in average education and employment and reduced inequality in the offspring generation. [ABSTRACT FROM AUTHOR]