Table 3

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

Widowed versus marriedDivorced versus marriedLifelong single versus married
Relative risk (95% CI) p valueNumber of studies
Heterogeneity statistic
Relative risk (95% CI) p valueNumber of studies
Heterogeneity statistic
Relative risk (95% CI) p valueNumber of studies
Heterogeneity statistic
Studies adjusted for age and sex1.33 (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 education1.12 (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 health1.12 (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.