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 I ^{2}=0% | 1.41 (0.90 to 2.21) p=0.14 | n=2 I ^{2}=1.5% | 1.49 (0.61 to 3.63) p=0.38 | n=2 I ^{2}=46.1% |

Studies adjusted for age, sex and education | 1.12 (0.95 to 1.31) p=0.19 | n=5 I ^{2}=0% | 0.70 (0.47 to 1.06) p=0.10 | n=5 I ^{2}=0% | 1.45 (0.97 to 2.19) p=0.005 | n=4 I ^{2}=14.6% |

Studies adjusted for age, sex, education and physical health | 1.12 (0.92 to 1.37) p=0.26 | n=3 I ^{2}=77.8% | 1.30 (0.93 to 1.81) p=0.12 | n=2 I ^{2}=42.5% | 1.23 (1.17 to 1.29) p=0.36 | n=2 I ^{2}=0% |

Figures are based on random-effects meta-analysis.