Table 2

Results of meta-analysis by using different methods of dichotomising volume groups

Lowest volume group vs all othersEven dichotomy, middle group as HVEven dichotomy,
middle group as LV
(primary analysis)
Highest volume group vs all others
Mortality
Radical nephrectomyOR: 0.82
95% CI 0.71 to 0.94, p=0.01
OR: 0.83
95% CI 0.72 to 0.95, p<0.01
OR: 0.74
95% CI 0.61 to 0.90, p<0.01
OR: 0.72
95% CI 0.61 to 0.85, p<0.01
Partial nephrectomyOR: 0.48
95% CI 0.18 to 1.31, p=0.15
OR: 0.67
95% CI 0.17 to 2.75, p=0.58
OR: 0.84
95% CI 0.31 to 2.26, p=0.73
OR: 0.93
95% CI 0.31 to 2.77, p=0.90
Nephrectomy with venous thrombectomyOR: 0.59
95% CI 0.35 to 0.99, p=0.045
OR: 0.46
95% CI 0.27 to 0.80, p<0.01
OR: 0.48
95% CI 0.29 to 0.81, p=0.01
OR: 0.48
95% CI 0.25 to 0.92, p=0.03
Complications
Radical nephrectomyOR: 0.89
95% CI 0.78 to 1.01, p=0.07
OR: 0.84
95% CI 0.68 to 1.05, p=0.13
OR: 0.82
95% CI 0.73 to 0.92, p<0.01
OR: 0.82
95% CI 0.73 to 0.92, p<0.01
Partial nephrectomyOR: 0.82
95% CI 0.55 to 1.41, p=0.60
OR: 0.80
95% CI 0.47 to 1.36, p=0.40
OR: 0.85
95% CI 0.55 to 1.30, p=0.44
OR: 0.81
95% CI 0.53 to 1.24, p=0.33
  • HV, high volume; LV, low volume.