Table 2 Subgroup analysis of incidence of postoperative complications for each variable
Factors | Subgroups | Studies (n) | Patients (n) (experimental /control) | I2 (%) | Heterogeneity (p) | LOS, WMD (95% CI) |
|---|---|---|---|---|---|---|
Average age | 60–70 years | 8 | 3300/4542 | 0 | 0.885 | 0.67 (0.54, 0.83) |
70–80 years | 1 | 2514/2488 | – | – | 0.74 (0.66, 0.84) | |
> 80 years | 2 | 295/472 | 0 | 0.565 | 0.55 (0.39, 0.76) | |
Site | Joint | 7 | 3262/4527 | 0 | 0.831 | 0.67 (0.54, 0.84) |
Fracture | 3 | 2809/2960 | 36.4 | 0.208 | 0.72 (0.64, 0.80) | |
Spine | 1 | 38/15 | – | – | 0.47 (0.09, 2.41) | |
Continents | North America | 3 | 2678/2629 | 0 | 0.612 | 0.74 (0.65, 0.84) |
Oceania | 2 | 397/512 | 0 | 0.520 | 0.76 (0.51, 1.14) | |
Europe | 6 | 3034/4361 | 0 | 0.802 | 0.60 (0.49, 0.75) | |
Sample size | < 600 | 7 | 717/867 | 0 | 0.995 | 0.55 (0.42, 0.73) |
600–1000 | 1 | 297/412 | – | – | 0.83 (0.51, 1.35) | |
> 1000 | 3 | 5095/6233 | 5.6 | 0.347 | 0.73 (0.65, 0.82) |