Table 4.
Synthetic RRs for diabetes mellitus and aneurysmal subarachnoid hemorrhage.
| Synthetic estimation |
Heterogeneity |
||||
|---|---|---|---|---|---|
| Subgroup | No. of studies | RR (95% CI) | P-value | I2 (%) | P-value |
| Total studies | 18 | 0.59 (0.44, 0.79) | 0 | 55.7 | 0.001 |
| Study design | |||||
| Cohort | 3 | 0.34 (0.09, 2.14) | 0.103 | 68.4 | 0.013 |
| Case-control | 15 | 0.61 (0.46, 0.82) | 0.001 | 53.1 | 0.008 |
| Study quality | |||||
| High | 5 | 0.38 (0.27,0.54) | 0 | 0 | 0.655 |
| Moderate and Low | 13 | 0.69 (0.47,1.01) | 0.056 | 59.8 | 0.002 |
Abbreviations: RR, relative risk; CI, confidence interval; BMI, body mass index.