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. 2017 Nov 28;89(3):231–238. doi: 10.1136/jnnp-2017-316274

Table 3.

Meta-analyses of the risk of all cause dementia according to marital status stratified by covariate adjustment.

Widowed versus married Divorced versus married Lifelong single versus married
Relative risk (95% CI) p value Number of studies
Heterogeneity statistic		 Relative risk (95% CI) p value Number of studies
Heterogeneity statistic		 Relative risk (95% CI) p value Number of studies
Heterogeneity statistic
Studies adjusted for age and sex 1.33 (1.05 to 1.69)
p=0.02		 n=3
I2=0%		 1.41 (0.90 to 2.21)
p=0.14		 n=2
I2=1.5%		 1.49 (0.61 to 3.63)
p=0.38		 n=2
I2=46.1%
Studies adjusted for age, sex and education 1.12 (0.95 to 1.31)
p=0.19		 n=5
I2=0%		 0.70 (0.47 to 1.06)
p=0.10		 n=5
I2=0%		 1.45 (0.97 to 2.19)
p=0.005		 n=4
I2=14.6%
Studies adjusted for age, sex, education and physical health 1.12 (0.92 to 1.37)
p=0.26		 n=3
I2=77.8%		 1.30 (0.93 to 1.81)
p=0.12		 n=2
I2=42.5%		 1.23 (1.17 to 1.29)
p=0.36		 n=2
I2=0%

Figures are based on random-effects meta-analysis.