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Table 6 Comparison between operative time and stone size, site, HFU

From: Laser lithotripsy using dusting technique (low energy, high frequency) for symptomatic upper urinary tract stones

Patient number (60) Mean operative time in min ± SD (range) p value
Site of stone Ureteric; n = 34 (72%) 53.41 ± 12.08 (30–85) < 0.001
Pelvic n = 10 (17%) 66.8 ± 14.9 (40–90)
Calyceal n = 2 (3%) 55 ± 14.1 (45–65)
Pelvicalyceal n = 5 (8%) 87 ± 17.9 (65–100)
HFU  < 400; n = 5(8.33%) 57.00 ± 10.36 (45–70) < 0.05
400–800; n = 23 (38.33%) 56.39 ± 16.30 (40–100)
 > 800; n = 32 (53.33%) 60.25 ± 17.05 (30–100)
Stone size  < 1 cm n = 9 (15%) 41.67 ± 9.68 (30–60) < 0.01
1–2 cm n = 44(73.3%) 59.77 ± 12.28 (40–90)
 > 2 cm n = 7(11.6%) 72.14 ± 26.90 (45–100)