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Table 2 Subgroup analysis of incidence of postoperative complications for each variable

From: An enhanced recovery after surgery program in orthopedic surgery: a systematic review and meta-analysis

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)
  1. WMD weighted mean difference, CI confidence intervals