Table 3.
Subgroup meta-analysis for all-cause mortality
| Subgroup | No. of studies | Pooled RR (95 % CI) | I2 (%) | P a | P b |
|---|---|---|---|---|---|
| Study design | |||||
| Prospective | 6 | 2.67 (2.01, 3.55) | 28.7 | 0.220 | 0.029 |
| Retrospective | 4 | 1.58 (1.28, 1.93) | 28.1 | 0.243 | |
| Ascertainment of PAD with ABI only | |||||
| Yes | 4 | 2.33 (1.53, 3.53) | 62.9 | 0.044 | 0.649 |
| No | 6 | 2.05 (1.48, 2.83) | 64.1 | 0.016 | |
| Follow-up time, months | |||||
| <62 | 6 | 2.72 (2.04, 3.64) | 52.6 | 0.121 | 0.029 |
| ≥62 | 4 | 1.61 (1.30, 2.00) | 37.1 | 0.189 | |
| Diabetes mullitus(%) | |||||
| <29 | 5 | 2.13(1.58, 2.87) | 18.2 | 0.299 | 0.940 |
| ≥29 | 4 | 2.25(1.38, 3.68) | 84.2 | 0.000 | |
| PAD (%) | |||||
| <26 | 6 | 1.92 (1.45, 2.55) | 70.7 | 0.004 | 0.152 |
| ≥26 | 4 | 2.85 (1.98,4.10) | 0 | 0.694 | |
| Duration of dialysis, years | |||||
| <9.4 | 6 | 2.58 (1.97, 3.37) | 28.9 | 0.218 | 0.124 |
| ≥9.4 | 2 | 1.72 (1.29, 2.31) | 0 | 0.561 | |
a P value for heterogeneity within each subgroup. b P value for heterogeneity between subgroups in the meta-regression analysis