Studies using clinical examination for dementia ascertainment produced higher pooled estimates for the effect of being widowed (1.20 (1.02 to 1.41) versus 1.12 (1.07 to 1.18)) or lifelong single (1.42 (1.07 to 1.90) versus 1.23 (1.17 to 1.29)), and this difference nearly reached significance for the comparison of single and married people (p=0.06).
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Marriage and risk of dementia: systematic review and meta-analysis of observational studies.
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