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Table 4 Prognosis of residual stones within one month according to stone locations

From: Cost-effectiveness of anti-retropulsive devices varies according to the locations of proximal ureteral stones: a retrospective cohort study

  Type of procedure p value
URS URS + ARD
Stones from UPJ (mm)    
 ≤ 30    
 Residual stonea, No 5 4  
 Diameter (mm) 8.8 ± 2.9 6.0 ± 2.2 0.158
 Spontaneous pass, No 0 1 0.444
31–90    
 Residual stonea, No 11 7  
 Diameter (mm) 8.0 ± 3.1 4.9 ± 2.2 0.035
 Spontaneous pass, No 0 4 0.011
 > 90    
 Residual stonesa, No 0 0
  1. Bold fonts to highlight the statisitical significance
  2. aEvaluated at the time of one day after operation