I'm sure my divorce vastly improved my chances of not getting dementia. My social connections have exploded since then.
Marital Histories and Associations With Later-Life Dementia and Mild Cognitive Impairment Risk in the HUNT4 70+ Study in Norway
Abstract
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.
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