Figure 1.

(a) Stone diameter. Significantly larger stones were observed in the double J (DJ) stented group compared with the non-stented group (6.5 ± 2.3 mm vs. 5.7 ± 2.2 mm; P = 0.00589). (b) Mean duration of postoperative stent (days). For patients who required a postoperative double J (DJ) stent, the mean duration of catheterisation was significantly shorter in the stented group compared with the non-stented group (Group A, 12 days; Group B, 16 days; P = 0.00106).

Groups A and B were subdivided into four subsets according to the size and location of the stone in the ureter: (1), >5 mm in the middle and upper ureter; (2), >5 mm in lower ureter; (3), ≤5 mm in middle and upper ureter; (4), ≤5 mm in lower ureter.