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One session stone free rate (SFR) in Guy’s stone score grade and stone size category
| Stone size (mm) | Guy’s stone score | |||
|---|---|---|---|---|
| Grade I | Grade II | Grade III | Grade IV | |
| One session stone free/N (%) | ||||
| < 20 | 108/112 (96.43) | 19/24 (79.17) | 3/6 (50.00) | 0/0 (–) |
| 20–29 | 41/47 (87.23) | 35/45 (77.78) | 1/1 (100.00) | 0/0 (–) |
| 30–39 | 7/8 (87.50) | 17/24 (70.83) | 2/4 (50.00) | 0/0 (–) |
| 40–49 | 1/1 (100.00) | 4/10 (40.00) | 1/4 (25.00) | 1/2 (50.00) |
| ≥ 50 | 1/1 (100.00) | 6/11 (54.55) | 1/5 (20.00) | 2/5 (40.00) |
SFR stone free rate
